Question 1

The body’s compensation of metabolic alkalosis involves?

Accepted Answer

Answer reason: The body does this via hypoventilation, which reduces alveolar ventilation and retains CO2 (forming carbonic acid), counteracting the alkalemia. Increasing respiratory rate would blow off CO2 and worsen alkalosis, making it an unsafe/incorrect compensatory direction. Renal compensation involves increasing bicarbonate excretion, but changes in overall urine output are not the defining compensatory mechanism and are too nonspecific to be correct here.

Question 2

When assessing a patient for metabolic alkalosis, the nurse would expect to find?

Accepted Answer

Answer reason: Metabolic alkalosis commonly occurs with loss of gastric acid (vomiting/NG suction) or diuretic use, and it is tightly linked to electrolyte shifts. In alkalemia, hydrogen ions move out of cells and potassium moves into cells, contributing to hypokalemia. The kidneys also tend to excrete potassium to conserve hydrogen ions and maintain electroneutrality, further lowering serum potassium. The other options are nonspecific hemodynamic/renal findings that depend on the underlying cause rather than being a characteristic expected finding of the acid–base disorder itself.

Question 3

Which term refers to the pain that has a slower onset, is diffuse, radiates, and is marked by somatic pain from organs in any body activity?

Accepted Answer

Answer reason: Deep tissues and organs often produce a dull, aching sensation that becomes more noticeable with movement or activity due to traction, ischemia, or inflammation. This matches the description of diffuse, radiating pain linked to organs and body activity. In contrast, superficial pain from skin is typically sharp and well localized, and “acute” vs “chronic” classifies duration rather than the localization/radiation pattern described.

Question 4

The balance of anions and cations as it occurs across cell membranes is known as?

Accepted Answer

Answer reason: This concept explains why ions distribute so that extracellular and intracellular fluids remain overall electrically balanced even though specific ions differ in concentration. The sodium-potassium pump helps maintain ion gradients, but it is a mechanism, not the term for the overall balance of charges. Osmotic activity refers to water movement driven by solute concentration, not charge balance.

Question 5

What is most likely the underlying physiology of primary enuresis?

Accepted Answer

Answer reason: This includes reduced functional bladder capacity and/or delayed maturation of arousal pathways and detrusor inhibition during sleep, leading to involuntary nocturnal voiding. Psychogenic stress is more typical of secondary enuresis (a child who previously achieved continence and then relapses). Urinary tract infection and vesicoureteral reflux can cause urinary symptoms or recurrent infections, but they are not the usual physiologic basis of primary enuresis in otherwise healthy children.

Question 6

Pancreatic lipase functions best at a pH of?

Accepted Answer

Answer reason: Lipase specifically has optimal activity in this intestinal pH range, allowing effective triglyceride hydrolysis and micelle formation with bile salts. Strongly acidic conditions (e.g., pH 2) would inactivate pancreatic lipase and are more characteristic of the stomach, not the small intestine. An excessively alkaline pH like 10 is not physiologic for the duodenum and would reduce enzyme efficiency and disrupt normal digestion.

Question 7

The function of smooth endoplasmic reticulum is –?

Accepted Answer

Answer reason: The smooth endoplasmic reticulum is responsible for lipid and steroid synthesis, phospholipid production, and detoxification processes. Protein synthesis is carried out by the rough endoplasmic reticulum, energy production occurs in mitochondria, and cell division is not a function of the SER.

Question 8

Which structure in sperm provides energy for motility?

Accepted Answer

Answer reason: The midpiece of the sperm is densely packed with mitochondria that generate ATP via oxidative phosphorylation, supplying the energy needed for propulsion. The nucleus mainly carries genetic material, while the acrosome contains enzymes for penetrating the ovum during fertilization. The plasma membrane is involved in protection and signaling but is not the primary site of energy generation for movement.

Question 9

All the following enzymes are secreted by gastrointestinal system EXCEPT-?

Accepted Answer

Answer reason: Ptyalin (salivary amylase) is secreted in saliva, pepsin is secreted (as pepsinogen) by gastric chief cells, and chymotrypsin is secreted (as chymotrypsinogen) by the pancreas into the duodenum. Angiotensin is a peptide hormone of the renin–angiotensin–aldosterone system involved in blood pressure and fluid balance rather than digestion. Therefore it is the only option not secreted as a gastrointestinal digestive enzyme.

Question 10

The acid present in stomach is—?

Accepted Answer

Answer reason: This low pH denatures proteins, activates pepsinogen to pepsin, and helps reduce microbial load in ingested food. Sulfuric and acetic acids are not physiologic secretions of the stomach, and lactic acid may be produced by microbes or during abnormal fermentation rather than being the normal gastric acid. Therefore the correct choice is the one that matches normal gastric physiology.

Question 11

The process of stopping bleeding is called—?

Accepted Answer

Answer reason: It involves vascular constriction, platelet plug formation, and activation of the coagulation cascade to generate fibrin. Hemolysis instead refers to destruction of red blood cells, which can occur in transfusion reactions or certain anemias and does not describe bleeding control. Hemoglobin is the oxygen-carrying protein within red cells, and hematology is the medical specialty focused on blood disorders rather than a stopping-bleeding mechanism.

Question 12

Appearance (skin color) reflects—?

Accepted Answer

Answer reason: Skin color is primarily a sign of how well oxygenated hemoglobin is circulating in peripheral tissues. Poor oxygenation or impaired perfusion can cause pallor, cyanosis, or mottling, making appearance a rapid physiologic indicator of respiratory/circulatory adequacy. Heart rate and reflexes are assessed through pulse and neurologic response rather than color. Muscle tone is a neuromuscular finding evaluated by posture and resistance to movement, not by skin appearance.

Question 13

Score 2 in respiration indicates—?

Accepted Answer

Answer reason: A strong cry reflects good respiratory effort and adequate air exchange, which corresponds to the highest respiration score. Lower scores correspond to depressed respirations, such as slow/irregular breathing (1) or absent respirations (0). This distinction helps rapidly identify infants who may require immediate ventilatory support or further resuscitation steps.

Question 14

Physiological jaundice usually appears—?

Accepted Answer

Answer reason: It typically becomes visible after the first 24 hours and peaks around days 3–5 in term infants (later in preterm), which aligns with onset at 2–3 days. Jaundice present at birth or within the first 24 hours is more concerning for pathologic causes such as hemolysis or infection. Onset as late as 1 week or 1 month is less consistent with typical physiologic patterns and suggests other etiologies (e.g., breastfeeding jaundice, breast milk jaundice, cholestasis).

Question 15

Score 0 for respiration means—?

Accepted Answer

Answer reason: A score of 0 is assigned when respirations are absent, indicating apnea and the need for rapid assessment and potential resuscitative support. A score of 1 corresponds to slow, irregular respirations or a weak cry, while a score of 2 indicates a good, strong cry with regular breathing. Therefore, absent respirations best matches the definition of a respiration score of 0.

Question 16

Normal respiration rate in adults –?

Accepted Answer

Answer reason: The standard accepted physiologic range for healthy adults at rest is 12–20 breaths per minute. Rates below this range suggest bradypnea (often from CNS depression, opioids, or metabolic alkalosis), while higher rates suggest tachypnea from fever, pain, hypoxemia, acidosis, or pulmonary disease. The other options represent ranges more consistent with abnormal adult breathing patterns or age groups with higher baseline rates (e.g., infants/children).

Question 17

Hemoglobin carries –?

Accepted Answer

Answer reason: This allows efficient pickup of oxygen in the lungs and delivery to tissues based on partial pressure gradients. Glucose is mainly transported dissolved in plasma, urea is carried in plasma as a waste product for renal excretion, and hormones are typically transported free or bound to specific plasma proteins rather than by hemoglobin. Therefore, the best single answer is the gas hemoglobin is designed to bind and deliver.

Question 18

Normal body temperature is —?

Accepted Answer

Answer reason: 98.6°F Normal adult core body temperature is regulated by the hypothalamus and typically centers around 37°C. This corresponds to 98.6°F as the conventional single best value used in exams for “normal body temperature.” Values like 96°F–97°F are generally below typical normothermia and may reflect measurement site variation or mild hypothermia. A reading of 99°F can occur within normal diurnal variation for some people, but it is higher than the standard reference point asked by this question.

Question 19

Normal respiratory rate (breaths/min) is —?

Accepted Answer

Answer reason: The standard reference range for a healthy adult at rest is 12–20 breaths per minute, making this the only option that matches accepted vital-sign norms. A rate of 5–10 suggests bradypnea and may indicate CNS depression or opioid effect. Rates such as 28–40 and 50–60 represent tachypnea to extreme tachypnea, seen with fever, hypoxia, metabolic acidosis, pain/anxiety, or respiratory distress rather than normal resting physiology.

Question 20

Normal heart rate in adults (per minute)?

Accepted Answer

Answer reason: The typical normal range for a healthy adult at rest is about 60 to 100 beats per minute. Values like 30–40 or 40–60 are more consistent with clinically significant bradycardia (or athletic conditioning for some individuals) and are not the standard normal range tested on exams. A range such as 120–150 suggests tachycardia, commonly seen with fever, hypovolemia, pain, anxiety, or arrhythmias rather than baseline normal. Therefore, the best choice is the standard reference range used in clinical practice and nursing assessments.

Question 21

Enzyme that digests proteins -?

Accepted Answer

Answer reason: Pepsin, secreted as pepsinogen by chief cells and activated by gastric acid, cleaves peptide bonds to break proteins into smaller peptides. Amylase targets carbohydrates (starch), lipase targets fats (triglycerides), and sucrase targets disaccharides (sucrose) at the intestinal brush border. Therefore, the enzyme responsible for protein digestion among the choices is the gastric protease.

Question 22

Which vitamin helps in blood clotting?

Accepted Answer

Answer reason: This vitamin is essential for activating factors II, VII, IX, and X (and proteins C and S), so deficiency causes easy bruising and bleeding. Among the listed options, only this vitamin directly serves as a required cofactor for producing active clotting proteins. A common distractor is vitamin C, which supports collagen and capillary integrity and can cause bleeding in scurvy, but it is not a primary coagulation-factor activator.

Question 23

The primary organ of taste is —?

Accepted Answer

Answer reason: These taste buds are primarily located on the papillae of the tongue, making it the main organ responsible for gustation. Smell from the nose contributes strongly to flavor perception, but it is not the primary taste organ itself. Ear and skin do not contain the specialized taste receptor structures required for tasting.

Question 24

The fluid inside the cell is called –?

Accepted Answer

Answer reason: This internal fluid and its suspended organelles are collectively described as the cytoplasm. Plasma and serum are components of blood (extracellular), and lymph is an extracellular fluid within the lymphatic system, so they do not describe fluid inside cells. Therefore the term that best matches “fluid inside the cell” is the one denoting the cell’s internal fluid compartment.

Question 25

The process of breathing out is called —?

Accepted Answer

Answer reason: During exhalation, elastic recoil of the lungs and chest wall (and, in forced breathing, contraction of expiratory muscles) increases alveolar pressure above atmospheric pressure, pushing air out. This directly matches the term used for breathing out. “Inspiration” is the opposite phase, while “percussion” is an examination technique and “constriction” is not the standard term for exhalation.

Question 26

Dehydration due to diarrhea is treated with –?

Accepted Answer

Answer reason: Oral rehydration solution uses glucose-coupled sodium transport in the small intestine to enhance absorption of sodium and water even during ongoing diarrhea. This directly corrects dehydration and helps prevent complications like hypovolemia and metabolic derangements. The other options are not rehydration therapies: atorvastatin treats hyperlipidemia, amlodipine treats hypertension, and diclofenac is an NSAID that can worsen renal perfusion and gastrointestinal irritation in dehydrated patients.

Question 27

RBC lifespan is –?

Accepted Answer

Answer reason: As RBCs age, they become less deformable and are preferentially removed by splenic macrophages via extravascular hemolysis. The normal average lifespan in circulation is about 120 days, which underpins expected reticulocyte responses when hemolysis or blood loss occurs. Shorter timeframes like 30 or 90 days are inconsistent with normal RBC turnover and would imply markedly increased destruction or decreased survival.

Question 28

Human saliva produces?

Accepted Answer

Answer reason: Salivary glands secrete salivary amylase (ptyalin), which begins hydrolyzing starch into smaller polysaccharides and maltose during chewing and bolus formation. In contrast, pepsin is a gastric protease produced by the stomach, and trypsin is a pancreatic protease active in the small intestine. Although some lingual lipase exists, the classic and primary enzyme attributed to human saliva in basic physiology is amylase.

Question 29

Vomiting is controlled by?

Accepted Answer

Answer reason: The CNS then orchestrates the patterned motor response (diaphragm, abdominal muscles, esophageal sphincters) that produces emesis. The stomach can initiate afferent signals via vagal pathways (e.g., irritation or distension), but it does not control the reflex. Liver and kidney dysfunction can contribute to nausea via toxins/metabolic disturbances, yet the final control remains centrally mediated in the brainstem.

Question 30

Low oxygen in tissues is called ?

Accepted Answer

Answer reason: This term specifically describes reduced tissue oxygenation regardless of the underlying cause (e.g., low arterial oxygen, poor perfusion, anemia, or impaired cellular use). Anoxia is a more extreme state implying near-complete absence of oxygen in tissues, not simply low levels. Cyanosis is a clinical sign of increased deoxygenated hemoglobin and may be absent in some hypoxic states, while apnea describes cessation of breathing rather than tissue oxygen status.

Question 31

Bluish discoloration of skin is -?

Accepted Answer

Answer reason: This classic clinical sign is termed cyanosis and is often noted around the lips, nail beds, and mucous membranes. Pallor refers to paleness from reduced blood flow or low hemoglobin, not a blue hue. Jaundice is yellowing from bilirubin elevation, and erythema is redness from capillary dilation/inflammation.

Question 32

Which cellular organelle contains enzymes that are considered digestive?

Accepted Answer

Answer reason: Lysosomes contain hydrolytic enzymes responsible for intracellular digestion, breakdown of waste materials, and recycling of cellular components.

Question 33

Which of the following reflex is present at birth?

Accepted Answer

Answer reason: This startle response is typically present at birth and should be elicitable in a normal term infant, then fades by about 4–6 months. By contrast, the parachute response is a postural protective reflex that appears later (around 8–9 months) as motor control matures. Persistent absence or asymmetry of primitive reflexes in a newborn raises concern for neurologic injury (e.g., brachial plexus injury or CNS depression).

Question 34

A patient presents with dysphagia, characterized by difficulty in swallowing both solids and liquids. Which of the following physiological processes is most likely impaired?

Accepted Answer

Answer reason: Dysphagia specifically reflects impaired deglutition (a key component of ingestion), leading to difficulty with both solids and liquids. Secretion, digestion, and absorption occur after the bolus has been swallowed and moved into the gastrointestinal tract, so they do not directly explain the primary problem described. A common distractor is digestion, but digestion refers to mechanical/chemical breakdown of food, not the act of swallowing.

Question 35

What is the main function of red blood cells?

Accepted Answer

Answer reason: Their biconcave shape increases surface area and shortens diffusion distance, improving oxygen loading and unloading. Fighting infections is primarily the role of white blood cells, not erythrocytes. Producing hormones and digesting proteins are functions of endocrine and gastrointestinal systems/enzymes, respectively, not circulating red cells.

Question 36

The powerhouse of the cell is —?

Accepted Answer

Answer reason: The organelle that generates the majority of ATP through aerobic respiration (citric acid cycle and oxidative phosphorylation) is the mitochondrion, hence the term “powerhouse.” Ribosomes mainly synthesize proteins, the Golgi apparatus modifies and packages proteins/lipids, and lysosomes perform intracellular digestion. Therefore the option identifying ATP production capacity is the best answer.

Question 37

Average blood volume in adult –?

Accepted Answer

Answer reason: This estimate reflects the combined plasma and cellular components circulating in the vascular system under resting conditions. Volumes like 3–4 L are more consistent with smaller body size or significant hypovolemia, while 6 L is more typical of larger individuals rather than the average adult. Therefore, the best single average value is 5 L.

Question 38

Oxygen is transported mainly by –?

Accepted Answer

Answer reason: Only a small fraction of oxygen is transported dissolved in plasma, because oxygen has limited solubility. White blood cells and platelets are not designed for gas transport and do not contribute meaningfully to oxygen carriage. Therefore, the primary transporter of oxygen in blood is hemoglobin.

Question 39

Fever above 104°F is called –?

Accepted Answer

Answer reason: This level is typically termed high-grade (high) fever and is clinically significant because it increases metabolic demand and can be associated with serious infection or heat-related illness. Mild and moderate fever correspond to lower temperature ranges and do not match the threshold given. Subnormal temperature refers to below-normal body temperature, the opposite of fever.

Question 40

Which gas is essential for respiration?

Accepted Answer

Answer reason: Oxygen serves as that final electron acceptor, enabling oxidative phosphorylation and sustained energy production in most tissues. Without adequate oxygen delivery, cells shift toward anaerobic metabolism with markedly reduced ATP yield and lactate accumulation. Nitrogen is largely inert in human metabolism, hydrogen is not used as an inhaled respiratory substrate, and carbon dioxide is primarily a waste product of metabolism rather than the required gas for ATP generation.

Question 41

The process of cell division is —?

Accepted Answer

Answer reason: This is achieved by DNA replication followed by one nuclear division and cytokinesis, maintaining the same chromosome number as the parent cell. Meiosis is a specialized reduction division that produces gametes with half the chromosome number, not typical “cell division” for most body tissues. Binary fission is the main reproductive division method of prokaryotes, and fusion refers to joining of cells or gametes rather than division.

Question 42

Which part of brain controls breathing?

Accepted Answer

Answer reason: The medulla contains the dorsal and ventral respiratory groups that drive inspiratory effort and coordinate basic respiratory rhythm, with input from chemoreceptors responding to CO2/pH. The cerebrum can voluntarily modify breathing (e.g., breath-holding) but does not maintain automatic ventilation. The cerebellum coordinates movement and the thalamus relays sensory signals, neither serving as the primary respiratory control center.

Question 43

Which electrolyte imbalance causes cardiac arrest?

Accepted Answer

Answer reason: As serum potassium rises, ECG changes can progress from peaked T waves to PR prolongation, QRS widening, sine-wave patterns, and then ventricular fibrillation or asystole (cardiac arrest). This makes elevated potassium the classic electrolyte disturbance most directly linked to sudden arrest risk. Hyponatremia more commonly causes neurologic symptoms (e.g., confusion, seizures) rather than primary arrest, and iron is not an electrolyte.

Question 44

Which organ regenerates?

Accepted Answer

Answer reason: The key principle is that some tissues retain strong capacity for compensatory hyperplasia after injury or partial resection. Hepatocytes can re-enter the cell cycle and restore functional liver mass, which is why partial hepatectomy can be followed by substantial regrowth. In contrast, adult cardiac myocytes have minimal proliferative capacity, so the heart does not meaningfully regenerate after infarction. Kidney and lung can show limited repair in certain compartments, but they do not match the classic, robust regenerative capacity tested for this question.

Question 45

Which electrolyte abnormality causes Chvostek sign?

Accepted Answer

Answer reason: Chvostek sign reflects neuromuscular irritability caused by decreased ionized calcium, which lowers the threshold for nerve depolarization. Tapping the facial nerve triggers involuntary facial muscle contraction when calcium is low, making this a classic bedside finding of hypocalcemia. Hyperkalemia primarily affects cardiac conduction and skeletal muscle weakness rather than facial nerve hyperexcitability. Hypomagnesemia can contribute indirectly by impairing PTH release and causing functional hypocalcemia, but the sign is most directly attributed to low calcium itself.

Question 46

The nurse is testing a patient’s visual accommodation. Which of the following is a normal finding?

Accepted Answer

Answer reason: When shifting gaze from near to far, the parasympathetic-driven constriction relaxes and the pupil enlarges as part of returning to distance viewing. This makes dilation with distant focus the expected normal change during accommodation testing. By contrast, constriction is expected with near focus, not distant focus. Reacting to light is a normal pupillary light reflex but is not the specific finding for accommodation.

Question 47

What is the function of Bile in digestion?

Accepted Answer

Answer reason: This emulsification is essential for efficient digestion and absorption of dietary lipids and fat-soluble vitamins (A, D, E, K) in the small intestine. Bile does not enzymatically hydrolyze carbohydrates or proteins; those are primarily digested by amylases and proteases, respectively. A common confusion is thinking bile “digests” fats directly, but its key role is mechanical/chemical emulsification and micelle formation to facilitate absorption.

Question 48

Among the following respiratory terms, which one fits the description: The quantity of air that can be drawn in after the expiration of a normal tidal volume?

Accepted Answer

Answer reason: Physiologically, it equals tidal volume plus inspiratory reserve volume, matching the description of drawing in air after a normal tidal breath has been exhaled. Expiratory reserve volume instead refers to additional air that can be exhaled after a normal expiration, which is the opposite direction of airflow. Vital capacity involves the total movable volume between maximal inspiration and maximal expiration, making it broader than the described maneuver.

Question 49

Where does segmentation occur in the digestive tract?

Accepted Answer

Answer reason: This pattern is characteristic of the small intestine, where nutrient absorption is the primary function and mixing improves enzymatic action and mucosal exposure. In contrast, the esophagus primarily performs peristalsis for propulsion, and the stomach’s dominant motility includes receptive relaxation and antral pumping rather than classic segmentation. The colon does have haustral contractions for mixing, but segmentation as classically taught for the digestive tract is centered in the small intestine, making the “colon only” choice incorrect.

Question 50

What is the role of chief cells in the stomach?

Accepted Answer

Answer reason: This matches the physiologic division of labor in the stomach lining. By contrast, HCl is produced by parietal cells, mucus is produced by surface mucous/mucous neck cells, and gastrin is released by G cells (especially in the antrum). Therefore, pepsinogen secretion is the unique defining role of chief cells among the options.

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