Question 1

What is the primary function of pepsin in the stomach?

Accepted Answer

Answer reason: Digest proteins Pepsin is the main gastric protease and functions to hydrolyze peptide bonds, initiating protein digestion in the stomach. It is secreted as pepsinogen by chief cells and is activated in the acidic environment created by hydrochloric acid. Carbohydrate digestion primarily begins with salivary/pancreatic amylase, bile relates to fat emulsification, and neutralizing acid is done by bicarbonate in mucus and pancreatic secretions.
Category reason: This question tests the normal digestive enzyme function in the stomach, which is a core concept of human physiology rather than a nursing intervention or prioritization scenario.

Question 2

Which organ controls reflexes, movement coordination, and basic survival functions?

Accepted Answer

Answer reason: A. Brainstem The brainstem (midbrain, pons, medulla) contains vital autonomic control centers for breathing, heart rate, and blood pressure, which are essential for basic survival. It also mediates many primitive reflexes (e.g., gag, cough, pupillary reflexes) via cranial nerve nuclei and reticular formation. While the cerebellum is key for coordination and the spinal cord for many reflex arcs, only the brainstem directly governs life-sustaining functions along with reflex integration.
Category reason: This question tests foundational function of central nervous system structures (autonomic life-sustaining centers and reflex control), which is core neurophysiology rather than nursing intervention or prioritization.

Question 3

Which part of the brain controls temperature regulation, hunger, and thirst?

Accepted Answer

Answer reason: Hypothalamus The hypothalamus is the key homeostatic control center that regulates body temperature, appetite (hunger/satiety), and thirst via osmoreceptors and autonomic/endocrine outputs. It integrates signals from the body and brain and coordinates responses such as sweating/shivering and behavioral drives to eat or drink. The thalamus mainly relays sensory information, the cerebellum coordinates movement, and the pons is primarily involved in respiratory and arousal functions rather than these homeostatic drives.
Category reason: This question tests core brain homeostasis functions (temperature regulation, hunger, thirst), which is a foundational physiology concept rather than a nursing care/intervention scenario.

Question 4

Q.Amount of blood pumped by an adult heart is about?

Accepted Answer

Answer reason: 400 L An adult’s resting cardiac output is about 5 L/min. Over an hour this is approximately 300 L, and over ~80 minutes it is about 400 L, which matches the typical teaching estimate for blood pumped in roughly 1–1.5 hours at rest. The other values are either too low for an hour-plus estimate or do not align as closely with standard cardiac output calculations.
Category reason: This question tests normal cardiac output/blood flow calculations, which is a foundational body-function concept in Physiology rather than a nursing intervention or safety decision.

Question 5

How do plants manufacture vitamins?

Accepted Answer

Answer reason: Photosynthesis Plants synthesize many organic compounds needed for growth using photosynthesis, converting light energy, carbon dioxide, and water into carbohydrates that serve as precursors for various biomolecules. Many vitamins in plants are produced through metabolic pathways that depend on photosynthetically generated sugars and energy. In contrast, soil mainly provides minerals, and water absorption supplies water but does not “manufacture” vitamins.
Category reason: This question tests a foundational concept about how plants produce organic nutrients using energy transformation and metabolism, which fits under physiology rather than nursing care or clinical decision-making.

Question 6

Acid present in the gastric juice is?

Accepted Answer

Answer reason: Hydrochloric acid Hydrochloric acid (HCl) is the primary acid secreted by gastric parietal cells and is responsible for the low pH of gastric juice. This acidic environment helps denature proteins and activates pepsinogen into pepsin for protein digestion. The other listed acids are not physiologic primary components of human gastric secretions.
Category reason: This item tests normal body function (composition of gastric secretions and their role in digestion), which is a core topic in physiology rather than a nursing intervention or safety decision.

Question 7

The functional unit of the nervous system/is?

Accepted Answer

Answer reason:  Neuron The neuron is the basic structural and functional unit of the nervous system responsible for receiving, processing, and transmitting nerve impulses. Brain and spinal cord are organs/structures made up of many neurons and supporting glial cells. A nerve is a bundle of axons (nerve fibers) in the peripheral nervous system, not the fundamental unit itself.
Category reason: This is a foundational question about the basic functional unit of the nervous system, which is part of core neurophysiology rather than nursing judgment or patient-care decision-making.

Question 8

Which vitamin is essential for blood clotting?

Accepted Answer

Answer reason: Vitamin K Vitamin K is required for hepatic gamma-carboxylation of clotting factors II, VII, IX, and X (and proteins C and S), enabling them to bind calcium and function in the coagulation cascade. Deficiency can lead to prolonged PT/INR and increased bleeding tendency. The other listed vitamins have key roles in collagen synthesis (C), DNA synthesis/hematopoiesis (B12), and calcium/bone metabolism (D), not primary coagulation factor activation.
Category reason: This tests foundational understanding of how vitamins support normal physiologic processes, specifically coagulation factor activation, which fits Physiology rather than nursing interventions or prioritization.

Question 9

The Stomach store the food for

Accepted Answer

Answer reason: 4 – 5 hours Gastric emptying and the time food is held in the stomach typically averages around 2–6 hours depending on meal composition, with mixed meals commonly approximated at about 4–5 hours. Liquids and carbohydrate-rich meals empty faster, while fatty meals slow gastric emptying. Therefore, 4–5 hours is the best general estimate among the options provided.
Category reason: This question asks about how long food is retained in the stomach (gastric emptying/storage time), which is a functional concept of the gastrointestinal tract and belongs to Physiology.

Question 10

Which condition can cause the acid-base imbalance, metabolic alkalosis?

Accepted Answer

Answer reason: Excessive vomiting Metabolic alkalosis commonly results from loss of gastric acid (hydrochloric acid) through prolonged or excessive vomiting, which raises serum bicarbonate relative to hydrogen ions. This is often accompanied by hypochloremia and can be worsened by volume depletion (“contraction alkalosis”). Hyperventilation causes respiratory alkalosis, while opioid toxicity causes hypoventilation leading to respiratory acidosis. Urinary retention is not a typical primary cause of metabolic alkalosis.
Category reason: This question tests the physiologic mechanisms of acid–base regulation (how vomiting affects hydrogen ion and bicarbonate balance), which is foundational body-function knowledge rather than a nursing intervention/prioritization scenario.

Question 11

Q. which of organic continuously works ( 24 hours).?

Accepted Answer

Answer reason: Heart The heart contracts continuously to maintain circulation of oxygenated blood and remove metabolic wastes, and it does so day and night without voluntary control. Although the brain also remains active during sleep, the question typically targets the organ with continuous rhythmic mechanical work essential for life. The nose and eyes do not function continuously in the same uninterrupted manner (e.g., eyes close during sleep).
Category reason: This is a foundational question about continuous organ function and vital physiological processes, which falls under Physiology rather than nursing care decision-making.

Question 12

How many times does your heart beat in life time?

Accepted Answer

Answer reason: 3 Billion A typical resting heart rate is about 60–100 beats per minute, which over an average lifespan (~70–80 years) totals on the order of 2.5–4.0 billion beats. Thus “3 Billion” is the closest estimate among the choices. “10 million” is far too low for even a few months of normal cardiac activity, and “2 Billion” is generally low for a full lifetime average.
Category reason: This is a foundational question about normal cardiac function over time (heart rate and lifetime beat count), which is a Physiology concept rather than a nursing care/intervention scenario.

Question 13

In circulation, EPO has a half-clearance time of?

Accepted Answer

Answer reason: 3 to 6 hours Erythropoietin (EPO) is a glycoprotein hormone with a relatively short plasma half-life, commonly cited around 4–5 hours in circulation. This fits best within the 3 to 6 hour range among the options. The short half-life is consistent with hormonal signaling that is regulated by oxygen tension and rapidly adjusts erythropoietic drive.
Category reason: This question tests the circulation half-life (pharmacokinetic/physiologic time course) of the hormone EPO rather than a nursing intervention, placing it under Physiology.

Question 14

Which organ is known as "Metabolic factory" of the body?

Accepted Answer

Answer reason: Liver The liver is termed the body’s “metabolic factory” because it is the central site for carbohydrate, fat, and protein metabolism. It regulates blood glucose via glycogenesis, glycogenolysis, and gluconeogenesis, and it synthesizes cholesterol, lipoproteins, and many plasma proteins. It also performs key detoxification/biotransformation reactions and bile production, making it the dominant metabolic hub compared with the stomach, pancreas, or kidneys.
Category reason: This item tests foundational knowledge of which organ carries out most systemic metabolic processes, which is a core topic in physiology rather than nursing care decision-making.

Question 15

Which of the following air pollution causes serious health issues due to its greater affinity for hemoglobin in blood in comparison to oxygen?

Accepted Answer

Answer reason: Carbon Monoxide Carbon monoxide binds hemoglobin with an affinity far greater than oxygen, forming carboxyhemoglobin and reducing the blood’s oxygen-carrying capacity. This also shifts the oxyhemoglobin dissociation curve to the left, impairing oxygen release to tissues and leading to cellular hypoxia. Sulphur dioxide and ozone primarily cause airway irritation and inflammation, while carbon dioxide causes hypercapnia rather than strong competitive binding to hemoglobin.
Category reason: This question tests the physiologic principle of gas transport in blood and hemoglobin binding affinity, which is core Respiratory/oxygenation physiology rather than nursing care decision-making.

Question 16

Q . Painful muscle cramps are most commonly caused by?

Accepted Answer

Answer reason: Hypokalemia Low potassium increases neuromuscular excitability and impairs normal muscle cell repolarization, which commonly presents as muscle weakness, cramps, and sometimes constipation or ileus. Hyperkalemia more typically causes weakness and dangerous cardiac conduction abnormalities rather than cramping. Hyperglycemia is not a typical direct cause of acute painful muscle cramps, and hypercalcaemia more often causes decreased neuromuscular excitability (e.g., weakness, constipation) rather than cramping.
Category reason: This item tests the physiologic effect of electrolyte imbalance (potassium) on neuromuscular function rather than a nursing intervention, so it fits Physiology under NursingScience.

Question 17

Volume of blood present in adult human body.

Accepted Answer

Answer reason: 5-6 Liters An average adult has a total blood volume of about 70 mL/kg, which is roughly 5 liters in a 70-kg person (often cited as ~5–6 L depending on body size and sex). Values like 3–4 L are typically too low for a normal adult, while 8–12 L is far above expected physiologic blood volume. Therefore, 5–6 liters best matches standard physiologic norms.
Category reason: This asks for normal total blood volume in an adult, a foundational body-function fact related to circulatory physiology rather than a nursing intervention or prioritization task.

Question 18

Which organ can survive the longest without oxygen.?

Accepted Answer

Answer reason: D) Skin The brain is the most oxygen-sensitive organ and can suffer irreversible injury within minutes of anoxia, while kidneys and liver also have relatively high metabolic demand and tolerate ischemia poorly. Skin has comparatively lower metabolic requirements and can rely more on diffusion from ambient air and local microcirculation, allowing greater tolerance to reduced oxygen delivery. Therefore, among the listed choices, skin can survive the longest without oxygen.
Category reason: This is a foundational question about tissue oxygen requirements and relative tolerance to hypoxia/ischemia, which is primarily physiology rather than nursing care decisions.

Question 19

What makes blood red?

Accepted Answer

Answer reason: Hemoglobin Hemoglobin is the iron-containing pigment in red blood cells that gives blood its red color. Oxygenation changes the shade (bright red when oxygenated, darker when deoxygenated), but the chromophore responsible is hemoglobin itself. Plasma is straw-colored and does not confer the red color of whole blood.
Category reason: This question tests the basic physiologic basis of blood coloration and the role of hemoglobin in red blood cells, which is core Physiology content rather than a nursing care decision.

Question 20

A nurse reviews the most recent ABGs on a patient admitted two days ago. The values include pH=7.36; pCO2=31; pO2=85; HCO3=16. The nurse determines what acid-base imbalance is present?

Accepted Answer

Answer reason: Compensated Metabolic Acidosis The HCO3- is low (16), indicating a primary metabolic acidosis. The pCO2 is also low (31), consistent with respiratory compensation via hyperventilation to blow off CO2. The pH is near normal but slightly acid-leaning (7.36), supporting a compensated state rather than uncompensated acidosis. The other options do not match the primary abnormality (low bicarbonate).
Category reason: This question tests interpretation of ABG values and acid–base physiology (primary disturbance and compensation), which is foundational physiology rather than a nursing intervention/priority scenario.

Question 21

Which organ stores and releases red blood cells when needed?

Accepted Answer

Answer reason: Spleen The spleen serves as a reservoir for blood, including red blood cells and platelets, and can contract to release stored cells into circulation when needed (e.g., during sympathetic activation). It also filters aged or damaged red blood cells and participates in immune surveillance. The liver, kidney, and heart do not function as primary storage-and-release organs for red blood cells.
Category reason: This question tests organ function (storage/release and filtering roles in circulation), which is a foundational body-function concept best classified under Physiology rather than nursing care decision-making.

Question 22

Q. PH Value below 7 is called?

Accepted Answer

Answer reason: B. Acidic On the pH scale, 7 is neutral; values below 7 indicate increased hydrogen ion concentration, which is acidic. Values above 7 indicate alkalinity (basic). This principle applies broadly (e.g., blood pH, gastric acid, and metabolic/respiratory acid-base states).
Category reason: This question tests the foundational concept of the pH scale and acid-base balance, which is a physiology topic rather than a nursing intervention or clinical decision-making scenario.

Question 23

Normal human blood in nature is?

Accepted Answer

Answer reason: ALKALIN Normal arterial blood pH is tightly regulated around 7.35–7.45, which is slightly basic (alkaline). This alkalinity is maintained primarily by the bicarbonate buffer system, respiratory CO2 regulation, and renal acid/base handling. Because the normal pH is above 7.0, blood is considered alkaline rather than acidic or neutral.
Category reason: This item tests normal acid–base status (blood pH), a foundational body-function concept in physiology rather than a nursing intervention or clinical decision.

Question 24

Blood bank in the body is.....?

Accepted Answer

Answer reason: Spleen The spleen acts as a reservoir for blood, particularly storing and releasing red blood cells and platelets when needed, which is why it is commonly termed the body’s “blood bank.” It also filters aged or damaged erythrocytes and participates in immune surveillance. Neither the liver, kidney, nor heart primarily serves as a blood storage reservoir in this way.
Category reason: This item tests knowledge of the normal function of an organ (blood storage/reservoir role of the spleen), which is a foundational body-function concept best classified under Physiology rather than nursing decision-making.

Question 25

Q. The power house of energy in cells is?

Accepted Answer

Answer reason: Mitochondria Mitochondria are the primary sites of aerobic cellular respiration and oxidative phosphorylation, producing most of the cell’s ATP (usable energy). This ATP generation is why mitochondria are called the “powerhouse” of the cell. Golgi bodies package and modify proteins, ribosomes synthesize proteins, and the endoplasmic reticulum is involved in protein/lipid synthesis and transport rather than ATP production.
Category reason: This question tests basic cellular energy production and ATP generation, which is a foundational physiology concept (cellular respiration and organelle function).

Question 26

EPO production is increased in?

Accepted Answer

Answer reason: All of the above Erythropoietin (EPO) production by renal peritubular interstitial cells increases in response to reduced tissue oxygen delivery. Anemia and hypoxemia both decrease oxygen content/availability, stimulating hypoxia-inducible factors that upregulate EPO. Renal artery stenosis reduces renal perfusion and oxygenation of kidney tissue, which can also trigger increased EPO release. Therefore, all listed conditions can increase EPO production.
Category reason: This question tests the physiological regulation of erythropoietin production in response to hypoxia and renal perfusion changes, which is a foundational body-function concept rather than a nursing intervention scenario.

Question 27

Reflex action occur with the help of ____?

Accepted Answer

Answer reason: spinal cord Reflex actions are rapid, automatic responses mediated through a reflex arc, which is integrated at the spinal cord level for most simple reflexes (e.g., withdrawal reflex). This allows a fast response without requiring initial processing by the brain. The kidney and liver are not involved in neural signal integration required for reflex activity.
Category reason: This question tests the physiological basis of reflexes and where the reflex arc is integrated, which is a core concept in Physiology rather than nursing care decision-making.

Question 28

The functional unit of muscle is called?

Accepted Answer

Answer reason: Sarcomere The sarcomere is the basic functional (contractile) unit of striated muscle, defined as the segment between two Z lines. Muscle contraction occurs as actin and myosin filaments slide past each other within each sarcomere. Myofibrils are composed of repeated sarcomeres, the sarcolemma is the muscle cell membrane, and actin is a thin filament protein rather than the full functional unit.
Category reason: This item tests foundational understanding of how muscle contraction is organized at the microscopic level, which is a core Physiology concept rather than a nursing intervention/priority question.

Question 29

Digestive enzyme present in mouth

Accepted Answer

Answer reason: A. Ptyalin Ptyalin is salivary amylase, secreted by the salivary glands and active in the oral cavity to begin carbohydrate (starch) digestion. Pepsin is a proteolytic enzyme produced in the stomach (as pepsinogen) and functions best in an acidic gastric environment, not in the mouth. Therefore, the digestive enzyme present in the mouth is ptyalin.
Category reason: This question tests where specific digestive enzymes function in the gastrointestinal process, which is a core concept of human physiology rather than nursing care decision-making.

Question 30

Q. What called is happy hormone-?

Accepted Answer

Answer reason: Dopamine Dopamine is a key neurotransmitter in the brain’s reward and pleasure pathways, commonly referred to in basic education as a “happy hormone/chemical” because it reinforces motivation and feelings of reward. Oxytocine is more associated with bonding and social attachment, leptin regulates appetite/satiety, and ADH primarily regulates water balance. Therefore, dopamine best matches the question’s intent.
Category reason: This item tests foundational knowledge of neurochemical/hormonal roles in mood and reward pathways, which is primarily a Physiology concept rather than a nursing intervention or safety judgment.

Question 31

Power house of the cell is?

Accepted Answer

Answer reason: B) mitochondria Mitochondria are called the “powerhouse” of the cell because they generate most of the cell’s ATP through aerobic respiration and oxidative phosphorylation. ATP is the primary energy currency needed for cellular functions. The nucleus mainly controls genetic information and transcription, chloroplasts produce energy via photosynthesis in plants, and cytoplasm is the medium where many reactions occur but is not the primary ATP-generating organelle.
Category reason: This is a foundational question about cellular organelle function and energy production (ATP generation), which is a core concept in Physiology rather than nursing care decision-making.

Question 32

The nurse is told that the blood gas results indicate a pH of 7.50 and a Pco2 of 32 mm Hg. The nurse determines that these results are indicative of which acid-base disturbance?

Accepted Answer

Answer reason: Respiratory alkalosis. A pH of 7.50 indicates alkalemia, and a low PaCO2 of 32 mm Hg indicates hypocapnia from increased alveolar ventilation. Because the primary derangement is a decreased carbon dioxide (the respiratory component), this is respiratory alkalosis rather than metabolic alkalosis. Metabolic causes would show an elevated bicarbonate as the primary change, which is not provided here, while respiratory acidosis would have an elevated PaCO2.
Category reason: This question tests interpretation of arterial blood gas values and the physiologic relationship between pH and PaCO2, which is core acid-base physiology rather than a nursing intervention/prioritization scenario.

Question 33

Which hormone increases heart rate and blood pressure?

Accepted Answer

Answer reason: Adrenaline Adrenaline (epinephrine) is a sympathetic catecholamine that stimulates beta-1 receptors in the heart to increase heart rate and contractility, raising cardiac output. It also produces vasoconstriction via alpha-1 receptors in many vascular beds, which increases systemic vascular resistance and blood pressure. Insulin lowers blood glucose, melatonin promotes sleep, and progesterone is primarily a reproductive hormone and does not characteristically cause an acute rise in HR and BP.
Category reason: This item tests normal physiologic effects of a hormone on cardiovascular function (sympathetic fight-or-flight response), which is core Physiology rather than a nursing care decision.

Question 34

Heart take rest at?

Accepted Answer

Answer reason: Between two beats The heart’s “rest” period refers to diastole, when the myocardium relaxes and the ventricles fill with blood. This relaxation occurs after each contraction and before the next heartbeat, i.e., between two beats. Coronary artery perfusion also primarily occurs during diastole, reinforcing that this is the functional rest phase. Sleep may reduce heart rate but the heart still cycles through contraction and relaxation continuously.
Category reason: This question tests a basic concept of cardiac cycle function (systole vs diastole), which is a core Physiology topic rather than a nursing care decision.

Question 35

Function of blood in the body is?

Accepted Answer

Answer reason: Supplies oxygen in whole body. A primary function of blood is transport of respiratory gases; red blood cells carry oxygen bound to hemoglobin from the lungs to all tissues. This is an essential systemic role of blood in maintaining cellular metabolism. The other options are either vague/nonstandard (“maintains liquidity”), not a primary function (“helps in digestion”), or incorrect (“helps in standing”).
Category reason: This question tests a foundational body-function concept—blood’s role in transporting oxygen—which is a core topic in physiology rather than nursing judgment or patient-care decision-making.

Question 36

The powerhouse of the cell is?

Accepted Answer

Answer reason: Mitochondria Mitochondria are called the “powerhouse” because they generate most of the cell’s ATP via aerobic respiration (citric acid cycle and oxidative phosphorylation). ATP is the primary energy currency used to power cellular processes. The nucleus mainly stores genetic material, ribosomes synthesize proteins, and the Golgi body modifies and packages proteins/lipids rather than producing ATP.
Category reason: This is a foundational question about cell organelle function and energy (ATP) production, which fits basic cellular physiology rather than nursing clinical decision-making.

Question 37

Enzyme trypsin is secreted by …..?

Accepted Answer

Answer reason: Pancreas Trypsin is produced and secreted by pancreatic acinar cells in an inactive form, trypsinogen, as part of pancreatic juice. In the duodenum, enterokinase (enteropeptidase) converts trypsinogen to active trypsin, which then activates other pancreatic proteases. The liver does not secrete trypsin, and while activation occurs in the intestine, the enzyme originates from the pancreas.
Category reason: This question tests which organ produces a digestive enzyme, focusing on normal digestive gland function and enzyme secretion/activation, which is core Physiology rather than nursing care decisions.

Question 38

True or False Hypokalemia can cause cardiac arrhythmias.?

Accepted Answer

Answer reason: True Hypokalemia (low serum potassium) increases myocardial excitability and disrupts normal cardiac repolarization, which can precipitate dysrhythmias. It is classically associated with ECG changes such as flattened T waves, ST depression, and prominent U waves, and it can progress to atrial or ventricular arrhythmias. The risk is higher with severe potassium depletion and in patients taking digoxin or with underlying heart disease.
Category reason: This item tests the physiologic effect of an electrolyte imbalance (potassium) on cardiac electrical activity, which is foundational body-function knowledge rather than a nursing intervention scenario.

Question 39

The main function of placenta is?

Accepted Answer

Answer reason: All of the above The placenta serves as the fetal interface for gas exchange (oxygen and carbon dioxide) and provides nutrients to support fetal growth. It also removes fetal metabolic wastes (e.g., carbon dioxide, urea) by transferring them to the maternal circulation. Additionally, it functions as an endocrine organ, producing hormones such as hCG, progesterone, and estrogens to maintain pregnancy.
Category reason: This question tests core functions of the placenta (exchange and endocrine roles), which are normal body functions studied in Physiology rather than nursing interventions or clinical prioritization.

Question 40

Which activity is considered aerobic exercise?

Accepted Answer

Answer reason: Running Aerobic exercise is sustained rhythmic activity that increases heart rate and breathing and relies primarily on oxygen-dependent energy production. Running is a classic aerobic activity performed continuously over time and significantly challenges the cardiovascular and respiratory systems. Weightlifting is primarily anaerobic (short bursts), while yoga and stretching focus more on flexibility, balance, and low-intensity conditioning rather than sustained aerobic demand.
Category reason: This question tests understanding of exercise type classification and how activities affect cardiorespiratory function, which is foundational Physiology rather than a nursing-care decision.

Question 41

# Nerve impulses, through the synaptic cleft, transmits:

Accepted Answer

Answer reason: Acetylcholine Across the synaptic cleft, neurons communicate chemically via neurotransmitters released from presynaptic vesicles, not by direct flow of Na+, K+, or H+ between cells. Acetylcholine is a classic neurotransmitter that diffuses across the cleft and binds to receptors on the postsynaptic membrane to propagate the signal. Ions like Na+ and K+ primarily mediate electrical changes across each neuron's membrane rather than serving as the cleft-transmitted messenger.
Category reason: This item tests foundational nerve synaptic transmission mechanisms (chemical neurotransmission across a synapse), which is a core concept of physiology rather than nursing care decision-making.

Question 42

The nurse is caring for a client with severe diarrhea. The nurse monitors the client closely, understanding that this client is at risk for developing which acid-base disorder?

Accepted Answer

Answer reason: Metabolic acidosis. Severe diarrhea causes loss of bicarbonate-rich intestinal fluids, lowering serum HCO3− and producing a normal anion gap (hyperchloremic) metabolic acidosis. The kidneys may compensate by increasing acid excretion, and the lungs may compensate with increased ventilation (lowering PaCO2), but the primary disturbance remains metabolic acidosis. Respiratory disorders are not the primary consequence of bicarbonate loss from the GI tract.
Category reason: This question tests the physiologic mechanism of acid-base balance changes due to GI bicarbonate loss, which is foundational body-function knowledge rather than a nursing action/prioritization scenario.

Question 43

Which among the following function as locus of biochemical reactions?

Accepted Answer

Answer reason: Cell plasma Most cellular biochemical reactions occur in the cytoplasm (cell plasma), where metabolic pathways like glycolysis and many enzymatic processes take place. While some reactions occur in organelles (e.g., mitochondria), the cytoplasmic matrix remains a primary site for numerous biochemical activities. The cell membrane mainly regulates transport and signaling, and the cell wall provides structural support rather than serving as the main reaction site.
Category reason: This question tests where cellular biochemical reactions primarily occur, which is a core concept of cellular function and metabolism in physiology rather than a nursing care decision.

Question 44

Which organ in the human body has the highest internal temperature?

Accepted Answer

Answer reason: Liver The liver has one of the highest metabolic rates of any organ and generates substantial heat from continuous biochemical reactions (e.g., metabolism, detoxification, glycogen storage/breakdown). This high metabolic activity contributes to a higher internal temperature compared with organs like the stomach. While the heart is highly active, the liver’s large mass and intense metabolic workload make it a major heat-producing organ in the body.
Category reason: This question tests knowledge of organ heat production and metabolic activity, which is a core concept of human physiology rather than nursing interventions or prioritization.

Question 45

Which vitamin is responsible for blood coagulation?

Accepted Answer

Answer reason: Vitamin k Vitamin K is required for hepatic gamma-carboxylation of clotting factors II, VII, IX, and X, and proteins C and S, enabling them to bind calcium and function in the coagulation cascade. Deficiency leads to impaired clot formation and increased bleeding risk (e.g., elevated PT/INR). Vitamins A, C, and D have other primary roles (vision/epithelial health, collagen synthesis/antioxidant function, and calcium-phosphate homeostasis, respectively) rather than directly enabling coagulation factor activation.
Category reason: This question tests foundational knowledge of how a specific vitamin supports the coagulation cascade, which is a body-function concept in physiology rather than a nursing intervention or prioritization scenario.

Question 46

How many main parts does blood have?

Accepted Answer

Answer reason: 2 Blood is broadly divided into two main components: plasma and formed elements. Plasma is the liquid portion containing water, proteins, and solutes, while formed elements include red blood cells, white blood cells, and platelets. Many texts also describe “four components” when listing formed elements separately, but the question asks for the main parts, which is two.
Category reason: This question tests foundational knowledge of the components of blood (plasma vs formed elements), which is a basic body-function concept under Physiology rather than a nursing care decision.

Question 47

The average heart rate of a newborn is?

Accepted Answer

Answer reason: 100–160/min Normal newborn resting heart rate is typically around 120–160 beats/min, and many references cite a broader normal range of about 100–160 beats/min. Values such as 60–100/min are more consistent with older children or adults rather than neonates. Rates persistently >160–200/min would raise concern for tachycardia depending on activity, temperature, and clinical context.
Category reason: This asks for the normal physiologic vital-sign range (heart rate) in a newborn, which is a foundational body-function concept rather than a nursing intervention scenario.

Question 48

The “powerhouse of the cell” is?

Accepted Answer

Answer reason: Mitochondria Mitochondria are the primary sites of aerobic cellular respiration and ATP generation via the Krebs cycle and oxidative phosphorylation. Because ATP is the cell’s usable energy currency, mitochondria supply most of the energy needed for cellular activities. The nucleus stores genetic material and regulates gene expression, lysosomes digest cellular debris, and ribosomes synthesize proteins rather than producing ATP.
Category reason: This question tests foundational cell function and energy (ATP) production, which is a core concept in physiology rather than nursing care decision-making.

Question 49

Photosynthesis takes place in

Accepted Answer

Answer reason: Chloroplast Photosynthesis occurs in chloroplasts, the organelles in plant and algal cells that contain chlorophyll and the thylakoid membrane system. The light-dependent reactions occur on thylakoid membranes, producing ATP and NADPH, and the Calvin cycle occurs in the stroma to fix carbon dioxide into sugars. Mitochondria are primarily responsible for cellular respiration, and the nucleus stores genetic material rather than performing photosynthesis.
Category reason: This is a foundational question about where a key biological energy-conversion process occurs in cells, which fits cell physiology rather than clinical nursing care.

Question 50

The first step in Arterial blood Gas (ABG) interpretation is?

Accepted Answer

Answer reason: Check the pH The first step in ABG interpretation is to assess pH to determine whether the patient is acidemic (7.45). Once the primary acid-base status is identified, PaCO2 and HCO3− are compared to determine whether the disturbance is primarily respiratory or metabolic and whether compensation is present. PaO2 is evaluated separately to assess oxygenation but is not the first step in acid-base interpretation.
Category reason: This item tests the physiologic principles of acid-base balance and ABG interpretation sequence, which is primarily a foundational Physiology concept rather than a nursing intervention or prioritization scenario.

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