Question 1

At birth, what causes the first breath to be taken?

Accepted Answer

Answer reason: C. Cold stimulus and CO2 accumulation The initial respiratory effort in a newborn is primarily triggered by rising carbon dioxide levels (and resulting acidosis) after the placental gas exchange stops, which stimulates the respiratory center. Additional sensory inputs such as a sudden drop in temperature and tactile stimulation further promote initiation of breathing. Other choices may influence neonatal adaptation, but they are not the main immediate physiologic drivers of the first breath.
Category reason: This question tests the physiologic mechanisms that initiate neonatal respiration at birth, which is a normal body function rather than a nursing intervention or prioritization decision.

Question 2

Bradykinin has a role in:

Accepted Answer

Answer reason: After birth, increased oxygen tension and reduced prostaglandin E2 promote constriction of the ductus arteriosus. Bradykinin released from the lungs is one of the mediators that contributes to this postnatal constriction, helping transition from fetal to neonatal circulation. In contrast, prostaglandins help keep the ductus arteriosus patent in utero, and functional closure of the foramen ovale is primarily driven by pressure changes between the atria.
Category reason: This question tests fetal-to-neonatal circulatory transition mediators (e.g., bradykinin, prostaglandins) and the physiologic closure of fetal shunts, which is foundational cardiovascular physiology rather than a nursing intervention/priority.

Question 3

As a routine, All Newborn are given an intramuscular dose of –?

Accepted Answer

Answer reason: Newborns have low vitamin K stores due to limited placental transfer and a sterile gut at birth, which reduces endogenous vitamin K production. This deficiency predisposes to vitamin K deficiency bleeding (hemorrhagic disease of the newborn), which can cause serious internal or intracranial hemorrhage. A routine intramuscular dose shortly after birth provides reliable prophylaxis by enabling adequate activation of clotting factors II, VII, IX, and X.
Category reason: This tests foundational knowledge about neonatal vitamin K deficiency and coagulation physiology rather than a nursing priority or care-management decision, so it fits NursingScience (Physiology).

Question 4

A nurse is reviewing a patient’s vital signs. Which value is abnormal?

Accepted Answer

Answer reason: This represents a fever (≥38.0°C), indicating an abnormal elevation in core body temperature and commonly suggesting infection or inflammatory processes. The heart rate of 68/min is within normal adult range, and a respiratory rate of 22/min can be mildly elevated but may be normal depending on context. While 140/90 mmHg is hypertensive, fever is an unequivocal abnormality among standard vital sign ranges without additional context.
Category reason: This question primarily tests recognition of normal vs abnormal vital sign ranges, which is a foundational concept in human body function and homeostasis (physiology) rather than a nursing intervention or prioritization scenario.

Question 5

The normal temperature of a human body is ____?

Accepted Answer

Answer reason: Normal core body temperature is commonly taught as about 98.6°F (37°C), with a typical normal range roughly 97–99°F depending on site and time of day. Among the options, the Fahrenheit value closest to this standard is the best choice. The Celsius options are incorrect because normal is ~37°C, not ~98–99°C. 99.0°F is within normal variation but is less representative of the commonly cited normal baseline.
Category reason: This question tests a basic normal physiologic vital sign value (body temperature) rather than a nursing intervention or prioritization decision, so it fits Physiology under NursingScience.

Question 6

Which of the following features is common in both humans and adult frogs?

Accepted Answer

Answer reason: Adult frogs and humans primarily eliminate nitrogenous waste as urea, making them ureotelic. Internal fertilization is typical in humans but most frogs have external fertilization. Frogs (like other amphibians) have nucleated red blood cells, whereas humans have enucleated red blood cells. Humans have a four-chambered heart, but adult frogs have a three-chambered heart.
Category reason: This question tests comparative excretory physiology and other organismal physiological traits (fertilization type, RBC characteristics, cardiac chambers), which fits Physiology rather than nursing care decision-making.

Question 7

During fetal life, the percentage of cardiac output that bypasses the lungs is about?

Accepted Answer

Answer reason: In fetal circulation, the lungs are fluid-filled and have very high pulmonary vascular resistance, so only a small fraction of right ventricular output goes to the pulmonary arteries. Most blood is diverted away from the lungs through the foramen ovale and ductus arteriosus into the systemic circulation and placenta. As a result, roughly about 90% of combined ventricular output functionally bypasses the lungs before birth.
Category reason: This is a question about fetal circulatory physiology and distribution of cardiac output, which is foundational body-function knowledge rather than a nursing intervention or safety decision.

Question 8

What happens to pulmonary blood flow immediately after the first breath?

Accepted Answer

Answer reason: Lung expansion with the first breaths raises alveolar oxygen tension, which triggers pulmonary vasodilation and a sharp drop in pulmonary vascular resistance. This markedly increases pulmonary blood flow and shifts circulation from fetal right-to-left shunting toward the lungs. The concurrent rise in left atrial pressure helps functionally close the foramen ovale, reinforcing the postnatal pattern of circulation.
Category reason: This question tests the physiologic transition at birth (changes in pulmonary vascular resistance and blood flow after the first breath), which is a core concept of cardiovascular/respiratory physiology rather than a nursing intervention scenario.

Question 9

The total fetal cardiac output is highest in which organ system?

Accepted Answer

Answer reason: In fetal circulation, the placenta functions as the organ of gas exchange and nutrient/waste transfer, so it receives a very large share of combined ventricular output via the umbilical arteries. The fetal lungs have high pulmonary vascular resistance and minimal flow, and although the liver and kidneys receive substantial perfusion, they do not exceed placental blood flow. Therefore, the organ system receiving the highest portion of fetal cardiac output is the placenta.
Category reason: This question tests foundational fetal circulation and distribution of cardiac output, which is a core physiology concept rather than a nursing intervention or safety judgment.

Question 10

Which electrolyte imbalance causes Trousseau’s sign?

Accepted Answer

Answer reason: Trousseau’s sign (carpopedal spasm with inflation of a blood pressure cuff) reflects increased neuromuscular excitability due to low ionized calcium. Calcium normally stabilizes neuronal membranes; when it falls, the threshold for depolarization decreases, leading to tetany. This is classically seen in hypocalcemia from causes such as hypoparathyroidism, vitamin D deficiency, or acute pancreatitis.
Category reason: This question tests the physiologic effect of an electrolyte (calcium) on neuromuscular excitability and classic physical signs, which is a foundational body-function concept rather than a nursing intervention.

Question 11

In fetal circulation, oxygenated blood is preferentially directed to?

Accepted Answer

Answer reason: Fetal circulation uses shunts (ductus venosus, foramen ovale, ductus arteriosus) to bypass the lungs and preferentially deliver the most oxygenated blood to vital organs. Blood from the umbilical vein is streamed across the foramen ovale to the left atrium and then the left ventricle, supplying the coronary and cerebral circulations via the ascending aorta. This prioritization supports myocardial and neurologic development in a low-oxygen fetal environment. In contrast, the lungs receive relatively less flow because gas exchange occurs at the placenta.
Category reason: This is a foundational question about how fetal blood flow is physiologically distributed via circulatory shunts, which fits Physiology rather than nursing care decisions.

Question 12

What change in pulmonary vascular resistance occurs immediately after birth?

Accepted Answer

Answer reason: With the first breaths, the lungs expand and alveolar oxygen tension rises, which causes pulmonary arteriolar vasodilation. This rapidly drops pulmonary vascular resistance and increases pulmonary blood flow, enabling effective gas exchange. The decrease also contributes to functional closure of fetal shunts (especially ductus arteriosus and foramen ovale) as left-sided pressures rise relative to right-sided pressures.
Category reason: This item tests the physiologic transition from fetal to neonatal circulation and the immediate hemodynamic response in the pulmonary vasculature, which is a foundational concept in physiology.

Question 13

What happens if the ductus venosus fails to close?

Accepted Answer

Answer reason: The ductus venosus normally diverts oxygenated umbilical venous blood past the fetal liver into the inferior vena cava, and it should close after birth to route portal blood through hepatic sinusoids. If it remains patent, blood continues to bypass the liver, creating an abnormal connection between portal and systemic circulation. This leads to reduced hepatic clearance of toxins and altered metabolism, a classic portosystemic shunt physiology. The other choices are not the primary direct consequence of persistent ductus venosus patency.
Category reason: This question tests fetal-to-neonatal circulatory physiology and the functional consequence of a persistent fetal vascular shunt, which is foundational biomedical knowledge rather than a nursing intervention scenario.

Question 14

What contributes to the high pulmonary resistance in fetal life?

Accepted Answer

Answer reason: B. Hypoxic vasoconstriction In fetal life, the lungs are fluid-filled and alveolar oxygen tension is low, which triggers pulmonary vasoconstriction. This hypoxic pulmonary vasoconstriction maintains high pulmonary vascular resistance and diverts most right ventricular output away from the lungs through fetal shunts. After birth, rising alveolar oxygen reverses this vasoconstriction, lowering pulmonary resistance. The other options would generally promote lower resistance (higher oxygen tension, higher surfactant) or are not the key mechanism.
Category reason: This question tests the physiologic mechanism regulating fetal pulmonary vascular resistance and the fetal-to-neonatal circulatory transition, which is core respiratory/cardiovascular physiology rather than a nursing intervention scenario.

Question 15

The normal closure of ductus arteriosus is functionally complete by?

Accepted Answer

Answer reason: B. 24–48 hours After birth, increased arterial oxygen tension and reduced prostaglandin E2 levels trigger smooth muscle constriction of the ductus, leading to functional closure typically within the first 1–2 days. Anatomic (permanent) closure occurs later as the vessel undergoes fibrosis to become the ligamentum arteriosum. Earlier time frames are too short for the usual population-level definition of functional closure, while 7 days to 1 month better aligns with anatomic closure rather than functional closure.
Category reason: This tests timing of normal postnatal circulatory transition (ductus arteriosus functional vs anatomic closure), which is a foundational physiology concept rather than a nursing intervention decision.

Question 16

The closure of which fetal vessel leads to increased liver perfusion postnatally?

Accepted Answer

Answer reason: In fetal life, this shunt diverts oxygenated blood from the umbilical vein away from the hepatic sinusoids directly into the inferior vena cava. After birth, its closure forces portal venous inflow to pass through the liver rather than bypassing it, thereby increasing hepatic perfusion. This supports the newborn’s transition to relying on hepatic metabolism and processing of nutrients and bilirubin.
Category reason: This is a foundational question about fetal-to-neonatal circulatory physiology and how postnatal shunt closure changes organ blood flow, which best fits Physiology rather than nursing decision-making.

Question 17

The fetal vessel that delivers deoxygenated blood to the placenta is the?

Accepted Answer

Answer reason: In fetal circulation, the paired umbilical arteries carry blood from the fetus toward the placenta for gas exchange and waste removal. This blood is relatively deoxygenated compared with what returns from the placenta. The umbilical vein, in contrast, returns oxygenated blood from the placenta to the fetus, while the ductus venosus shunts a portion of that blood past the liver into the inferior vena cava. The portal vein is part of hepatic portal circulation and is not the key vessel for fetal-placental exchange.
Category reason: This question tests a foundational concept of fetal circulation and blood flow direction, which is a normal body function topic under Physiology rather than a nursing intervention or safety judgment.

Question 18

Describe the significance of the medulla oblongata in maintaining life.

Accepted Answer

Answer reason: It contains autonomic control centers that generate and regulate respiratory rhythm, cardiac rate/contractility via autonomic output, and vasomotor tone that maintains blood pressure. Damage to this region can rapidly cause apnea, severe hypotension, and cardiac dysregulation, making it immediately life-threatening. The other options describe functions mainly associated with the spinal cord/thalamus (sensory relay), cerebral cortex (higher cognition), and motor cortex/cerebellum/basal ganglia (voluntary movement) rather than the medulla.
Category reason: This item tests foundational understanding of autonomic control of vital functions (respiration and cardiovascular regulation) by a brainstem structure, which is a core topic in Physiology rather than a nursing intervention/priority decision.

Question 19

Normal adult pulse rate is?

Accepted Answer

Answer reason: This range reflects the normal resting heart rate for healthy adults under typical conditions. Values below this are generally considered bradycardia and may be normal only in well-trained athletes or during sleep, while higher resting rates suggest tachycardia. Resting pulse can vary with fever, pain, anxiety, hypovolemia, medications, and physical conditioning, but the standard reference range remains 60–100 beats/min.
Category reason: This tests the normal reference range for an adult vital sign, which is foundational body-function knowledge under Physiology rather than a nursing intervention or prioritization scenario.

Question 20

Normal adult body temperature:

Accepted Answer

Answer reason: Normal adult core temperature is regulated by hypothalamic thermoregulation and is typically around 37°C, with an accepted normal range in the mid-36s to mid-37s. 35°C is abnormally low and suggests hypothermia, while 38°C is generally considered febrile in adults. 39°C represents high fever and is not a normal physiologic value.
Category reason: This question tests the normal physiologic range of core body temperature, which is a basic thermoregulation concept within Physiology rather than a nursing intervention scenario.

Question 21

Normal blood pressure in adults:

Accepted Answer

Answer reason: This value is classically taught as the standard reference for normal adult blood pressure and represents typical resting systolic and diastolic pressures. Readings such as 140/90 mmHg and 160/100 mmHg meet criteria for hypertension, not normal. A value like 100/70 mmHg can be normal for some individuals but is not the conventional benchmark used in basic physiology and nursing exams.
Category reason: This question tests a foundational reference range for a normal physiologic vital sign (arterial blood pressure) rather than a nursing intervention or prioritization decision, fitting Physiology.

Question 22

What happens to the pulse pressure during a fever?

Accepted Answer

Answer reason: Fever increases sympathetic tone and heart rate, which tends to reduce ventricular filling time and stroke volume. Systolic pressure may rise only modestly while diastolic pressure is maintained or can rise due to peripheral vasoconstriction, producing a smaller difference between systolic and diastolic pressures. This results in a narrowed pulse pressure compared with baseline. A widened pulse pressure is more typical of states like aortic regurgitation or high-output vasodilation rather than uncomplicated fever.
Category reason: This item tests a cardiovascular hemodynamic change (pulse pressure) in response to fever, which is a foundational body-function concept rather than a nursing intervention decision, fitting Physiology.

Question 23

Excessive loss of body water is?

Accepted Answer

Answer reason: It is the clinical state that results from a net deficit of total body water, typically due to reduced intake and/or increased losses. Diarrhea is a potential cause of water loss but is not itself the definition of the condition. Oedema reflects excess interstitial fluid rather than loss of body water, and clubbing is a chronic physical sign unrelated to acute fluid balance. Therefore the best single term for excessive loss of body water is dehydration.
Category reason: This item tests the definition of a fluid-balance state (loss of total body water), which is a foundational concept of body function and homeostasis under Physiology rather than a nursing intervention scenario.

Question 24

Which factor causes ductus arteriosus to close after birth?

Accepted Answer

Answer reason: After birth, ventilation of the lungs increases arterial oxygen levels, which promotes constriction of the ductus arteriosus smooth muscle. At the same time, placental removal lowers circulating prostaglandins, further favoring constriction rather than patency. Hypoxia and prostaglandins tend to keep the ductus open, and high pulmonary resistance is a fetal condition that supports right-to-left shunting rather than closure.
Category reason: This tests the normal postnatal physiologic change that triggers fetal shunt closure, which is a foundational concept in cardiovascular/respiratory physiology rather than a nursing intervention decision.

Question 25

When does anatomical closure of ductus venosus typically occur?

Accepted Answer

Answer reason: Functional closure of the ductus venosus occurs soon after birth as placental blood flow stops and umbilical venous return ceases. Over time, the vessel fibroses and becomes the ligamentum venosum, which is the anatomical closure. This fibrotic transformation is delayed compared with functional closure and is typically completed months after birth, making the later timeframe the best choice among the options.
Category reason: This item tests normal postnatal cardiovascular/fetal circulation transition timing (functional vs anatomical closure), which is a physiology concept rather than a nursing intervention or prioritization decision.

Question 26

The client is brought to the emergency department (ED) after passing out in a local department store. The client has been fasting and has ketones in the urine. Which acid-base imbalance would the nurse expect to assess in this client?

Accepted Answer

Answer reason: Fasting promotes fat breakdown with hepatic ketone production (acetoacetate and beta-hydroxybutyrate), which adds unmeasured acids to the blood. Accumulation of these organic acids consumes bicarbonate, lowering serum HCO3− and decreasing pH. This pattern is a high–anion gap metabolic acidosis (ketoacidosis), often with compensatory hyperventilation to reduce PaCO2. Respiratory disorders are not the primary disturbance because the initiating problem is increased acid generation rather than altered ventilation.
Category reason: This question tests the physiologic acid–base consequence of fasting-induced ketone production (ketoacidosis), which is foundational physiology rather than a nursing intervention or prioritization decision.

Question 27

Hypertrophy of muscle means-

Accepted Answer

Answer reason: Hypertrophy refers to an increase in the size of existing muscle fibers due to increased synthesis of contractile proteins, commonly from resistance training or increased workload. It is distinct from atrophy, which is decreased muscle size. It is also different from hyperplasia, which is an increase in the number of cells and is not the primary mechanism for skeletal muscle growth in humans. Scar tissue formation describes fibrosis, not hypertrophy.
Category reason: This question tests a foundational definition of muscle adaptation (hypertrophy vs atrophy/hyperplasia), which is a core concept in Physiology rather than a patient-care decision.

Question 28

Exposure to which substance protects the mucosal barrier of the stomach?

Accepted Answer

Answer reason: They enhance gastric mucosal defenses by stimulating mucus and bicarbonate secretion and supporting mucosal blood flow, which promotes epithelial repair. They also help maintain tight junction integrity and limit acid-related injury. In contrast, aspirin inhibits prostaglandin synthesis, while H. pylori and bile reflux disrupt the mucosal barrier and predispose to gastritis/ulceration.
Category reason: This question tests a foundational mechanism of gastric mucosal protection (normal physiologic regulation of mucus/bicarbonate and perfusion), which is primarily Physiology rather than a nursing intervention decision.

Question 29

Glucose transport enhances the absorption of which electrolyte?

Accepted Answer

Answer reason: Intestinal glucose uptake occurs via the SGLT1 cotransporter in the brush border, which couples glucose entry to sodium moving down its electrochemical gradient. This makes sodium absorption increase when glucose is present, a principle used in oral rehydration therapy to enhance fluid and electrolyte uptake. Potassium, phosphate, and chloride do not share this direct glucose-coupled cotransport mechanism in the small intestine.
Category reason: This tests a fundamental mechanism of nutrient-linked electrolyte transport in the gut (SGLT1), which is a core concept in Physiology rather than a nursing care decision.

Question 30

What causes reversal of flow in the ductus arteriosus after birth?

Accepted Answer

Answer reason: B. Drop in pulmonary resistance With the first breaths, the lungs expand and oxygenation increases, causing pulmonary arterioles to dilate and pulmonary vascular resistance to fall. This reduces pulmonary artery pressure relative to aortic pressure, creating a left-to-right pressure gradient across the ductus arteriosus. That new gradient reverses the fetal right-to-left shunt direction and sets the stage for functional closure as oxygen tension rises and prostaglandin levels fall.
Category reason: This question tests the normal cardiovascular transition at birth and pressure-resistance changes governing ductal flow, which is a core concept in Physiology.

Question 31

Which pressure is highest in fetal circulation?

Accepted Answer

Answer reason: In fetal circulation, the placenta provides a low-resistance pathway, and the left ventricle ejects blood into the systemic circuit, generating the highest pressures in the arterial system. The pulmonary vasculature has very high resistance in utero, so right-sided output is largely diverted through the ductus arteriosus rather than creating the highest sustained chamber pressure. Umbilical venous pressure remains relatively low because it is a return vessel from the placenta. Therefore, the highest pressure among the listed sites is in the systemic arterial outflow.
Category reason: This tests foundational hemodynamics and pressure relationships in fetal circulation, which is a physiologic concept rather than a nursing intervention or prioritization decision.

Question 32

Pulmonary circulation in the fetus is?

Accepted Answer

Answer reason: In fetal life, the lungs are fluid-filled and alveoli are not expanded, so pulmonary arterioles remain vasoconstricted, creating high pulmonary vascular resistance. This high resistance limits pulmonary blood flow, with most right ventricular output shunted away from the lungs through the ductus arteriosus into the systemic circulation. After birth, lung expansion and increased oxygen tension cause pulmonary vasodilation, lowering resistance and increasing pulmonary flow.
Category reason: This tests fetal cardiopulmonary hemodynamics (pulmonary vascular resistance and blood flow patterns), which is a foundational concept in physiology rather than a nursing intervention or prioritization scenario.

Question 33

The organ responsible for detoxification is?

Accepted Answer

Answer reason: The liver is the primary site of biotransformation of endogenous waste products and xenobiotics via phase I (e.g., cytochrome P450) and phase II conjugation reactions, making compounds more water-soluble for excretion. It also metabolizes drugs, inactivates hormones, and processes bilirubin and ammonia (via the urea cycle). Kidneys mainly excrete water-soluble substances and regulate fluid/electrolytes, while lungs primarily eliminate carbon dioxide and intestines play a minor role in eliminating some metabolites via bile.
Category reason: This question tests foundational organ function related to metabolism and detoxification rather than nursing interventions, aligning best with Physiology.

Question 34

The primary site for gas exchange in fetal life is?

Accepted Answer

Answer reason: In fetal life, oxygen and carbon dioxide exchange occurs across the placental membrane via maternal uteroplacental circulation rather than through the fetal lungs. The fetal lungs are fluid-filled and have high pulmonary vascular resistance, so they are not the functional organ for oxygenation before birth. Fetal blood is routed to prioritize systemic oxygen delivery through fetal shunts (ductus venosus, foramen ovale, ductus arteriosus), supporting placental-based gas exchange.
Category reason: This item tests basic physiologic function of fetal oxygenation and circulation rather than nursing interventions or prioritization, so it fits Physiology within NursingScience.

Question 35

The vessel that carries oxygenated blood from the placenta to the fetus is the?

Accepted Answer

Answer reason: In fetal circulation, oxygenated blood returns from the placenta to the fetus through a single vessel that enters at the umbilicus and travels toward the liver and heart. The two umbilical arteries carry deoxygenated blood from the fetus to the placenta, making them the opposite of what is asked. The ductus venosus is a fetal shunt that channels blood past the liver, and the inferior vena cava is a fetal systemic vein receiving mixed blood rather than being the placental return vessel.
Category reason: This question tests foundational fetal circulation—how blood flows between placenta and fetus—which is primarily a physiologic concept rather than a nursing intervention or clinical judgment scenario.

Question 36

Small for gestational age and large for gestational age infants have polycythemia because of:

Accepted Answer

Answer reason: Chronic intrauterine oxygen deprivation stimulates increased fetal erythropoietin release, which drives erythropoiesis and raises the hematocrit. Small-for-gestational-age infants often have placental insufficiency that limits oxygen delivery, while large-for-gestational-age infants (commonly from maternal diabetes) can develop relative fetal hypoxemia from increased metabolic demand. This physiologic compensation results in polycythemia and associated risks such as hyperviscosity and impaired perfusion.
Category reason: This question tests the physiologic mechanism linking intrauterine oxygenation to erythropoietin-driven red blood cell production, which is foundational Physiology rather than a nursing intervention scenario.

Question 37

The process of digestion starts in which part of the body?

Accepted Answer

Answer reason: Digestion begins in the oral cavity where mechanical breakdown occurs through chewing, increasing surface area for enzymes. Chemical digestion also starts here as salivary amylase initiates carbohydrate breakdown, and lingual lipase contributes to fat digestion. The stomach and small intestine continue digestion, but they are not the starting point.
Category reason: This question tests where digestion begins and the initial mechanical/enzymatic steps, which is a core concept of human physiology rather than nursing intervention or care prioritization.

Question 38

Which muscle type is involuntary and found in the walls of internal organs?

Accepted Answer

Answer reason: Smooth muscle is controlled by the autonomic nervous system and does not require conscious effort. It lines the walls of hollow internal organs such as the intestines, blood vessels, bladder, uterus, and bronchioles, where it regulates lumen diameter and propels contents via peristalsis. Skeletal muscle is voluntary and attached to bones, while cardiac muscle is involuntary but confined to the heart.
Category reason: This question tests foundational understanding of muscle types and involuntary control in organ walls, which is a core Physiology concept rather than a nursing care decision.

Question 39

What is the main function of red blood cells?

Accepted Answer

Answer reason: Red blood cells contain hemoglobin, which binds oxygen in the lungs and delivers it to tissues for cellular metabolism. They also transport a portion of carbon dioxide back to the lungs, but oxygen transport is their primary role. Immune defense is mainly performed by white blood cells, clotting by platelets and coagulation factors, and antibody production by B lymphocytes/plasma cells.
Category reason: This question tests the core biological role of red blood cells and hemoglobin in gas transport, which is a foundational body function topic within Physiology.

Question 40

CPR chest compression rate per minute in adults is?

Accepted Answer

Answer reason: This matches current adult Basic Life Support guidance targeting high-quality CPR. A rate in this range optimizes coronary and cerebral perfusion while allowing adequate recoil and ventilation coordination. Slower rates reduce forward blood flow, while excessively fast rates often lead to shallow compressions and incomplete recoil, decreasing perfusion.
Category reason: This tests knowledge of the recommended physiologic CPR parameter (adult compression rate) rather than a patient-specific nursing judgment or care-planning decision, fitting foundational physiology/CPR science.

Question 41

Amount of urine output in adults per hour should be at least?

Accepted Answer

Answer reason: B. 30 ml Adequate adult urine output is commonly defined as at least 0.5 mL/kg/hr, which for an average adult approximates 30 mL/hr. Outputs below this threshold suggest decreased renal perfusion and may be an early sign of hypovolemia, shock, or acute kidney injury. Sustained oliguria warrants prompt assessment of fluid status, hemodynamics, and possible obstruction.
Category reason: This question tests a normal physiologic parameter for renal function (minimum expected hourly urine output), which is a foundational concept in physiology rather than a nursing intervention or prioritization scenario.

Question 42

Which vitamin is synthesized in skin by sunlight?

Accepted Answer

Answer reason: UVB radiation converts 7-dehydrocholesterol in the epidermis to cholecalciferol (vitamin D3), which is then hydroxylated in the liver and kidneys to active calcitriol. This process is a key mechanism for maintaining calcium and phosphate homeostasis and supporting bone mineralization. Vitamins A, C, and B12 are not synthesized in human skin and must be obtained from dietary sources.
Category reason: This question tests a foundational body-function concept (cutaneous synthesis of a vitamin via sunlight exposure), which fits Physiology rather than a nursing care decision pathway.

Question 43

Which part of the brain controls body temperature?

Accepted Answer

Answer reason: It functions as the body’s thermoregulatory center by integrating temperature inputs from the blood and peripheral receptors. It maintains homeostasis via autonomic and endocrine responses such as sweating, shivering, vasodilation/vasoconstriction, and adjusting metabolic rate. The cerebrum mediates higher cognition, the cerebellum coordinates movement, and the medulla primarily controls vital cardiorespiratory reflexes rather than core temperature set-point regulation.
Category reason: This question tests foundational brain function (thermoregulation and homeostasis control centers), which is a core concept in physiology rather than nursing care prioritization or interventions.

Question 44

Average normal body temperature in Celsius is?

Accepted Answer

Answer reason: B. 37°C Normal adult core body temperature is commonly cited as approximately 37°C (98.6°F), representing the average set point for thermoregulation. While normal ranges vary with time of day, measurement site, age, and activity, 37°C remains the standard single-value average used in clinical teaching. The other options are either slightly below the typical average (36.5°C), slightly above it (37.5°C), or within febrile range for many adults (38°C).
Category reason: This asks for the standard average value of normal body temperature, a core thermoregulation concept within Physiology rather than a nursing intervention or care decision.

Question 45

The maximum amount of urea is present in?

Accepted Answer

Answer reason: Urea is synthesized in the liver via the urea cycle and then released into the bloodstream leaving the liver. Therefore, blood in the hepatic vein (draining the liver into the systemic circulation) has the highest urea concentration immediately after production. Renal vein blood has lower urea because the kidneys remove urea from plasma. The hepatic portal vein carries nutrient-rich blood from the gut to the liver and is not the primary outflow route for newly formed urea.
Category reason: This question tests where a metabolic waste product is produced and how it enters circulation, which is a foundational concept of body function and circulation physiology rather than nursing care decision-making.

Question 46

Newborn Cold Stress Signs Which newborn finding suggests cold stress?

Accepted Answer

Answer reason: Cold stress increases neonatal oxygen and glucose consumption through nonshivering thermogenesis, which can precipitate tachypnea/respiratory distress. Increased catecholamine release and hypoglycemia risk can present with neuromuscular irritability such as jitteriness. Pink hands/feet can be a normal acrocyanosis variant rather than cold stress, and a glucose of 70 mg/dL is within expected range for a newborn. Bradycardia and lethargy are more consistent with significant hypothermia or other serious illness rather than the typical early signs of cold stress.
Category reason: This question tests recognition of physiologic responses of a newborn to cold exposure (thermoregulation and metabolic/respiratory consequences), which is primarily foundational Physiology rather than a nursing management decision.

Question 47

A client admitted in ICU and ABG analysis result shows as PH-7.25, paCO2-40mm Hg and HCO3-18. From which acid-base condition the client is suffering?

Accepted Answer

Answer reason: A) Metabolic acidosis The pH is low (7.25), indicating acidemia. PaCO2 is normal at 40 mm Hg, so the primary disturbance is not respiratory. HCO3− is decreased (18), which explains the low pH and indicates a primary metabolic process, with minimal/no respiratory compensation shown in the provided values.
Category reason: This question tests interpretation of ABG values and the physiologic basis of acid–base disturbances, which is core Physiology rather than a nursing-intervention decision.

Question 48

Primary purpose of phototherapy in newborns—

Accepted Answer

Answer reason: Phototherapy treats neonatal hyperbilirubinemia by using light to photoisomerize bilirubin in the skin into more polar, water-soluble products (e.g., lumirubin). These products can be eliminated in bile and urine without requiring hepatic conjugation, lowering serum unconjugated bilirubin and reducing the risk of kernicterus. Increasing unconjugated bilirubin would worsen jaundice, and retinal protection is a safety measure during therapy rather than its primary purpose.
Category reason: This question tests the physiological mechanism by which phototherapy alters bilirubin to enhance excretion, which is foundational body-function knowledge rather than a nursing-care prioritization task.

Question 49

What is thelarche?

Accepted Answer

Answer reason: Thelarche refers to the onset of breast development as an early sign of female puberty driven by rising ovarian estrogen and other pubertal hormones. It typically precedes or accompanies other secondary sexual characteristics and reflects activation of the hypothalamic-pituitary-gonadal axis. The other options describe male breast changes (gynecomastia), pregnancy-related breast changes, or therapy-associated changes, which are different entities.
Category reason: This question tests understanding of normal pubertal physiologic changes and hormone-driven development, which fits Physiology.

Question 50

Normal pH of blood is?

Accepted Answer

Answer reason: Arterial blood is tightly regulated by buffers (especially bicarbonate), lungs (CO2 excretion), and kidneys (acid/base handling) to maintain a narrow pH range of about 7.35–7.45. A value of 7.4 is the commonly cited midpoint of this normal range. Values like 6.8 or 8.0 would represent severe, typically life-threatening acidemia or alkalemia due to enzyme and cellular dysfunction.
Category reason: This question tests normal acid–base physiology and homeostatic regulation of blood pH, which is a core Physiology concept.

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