Question 1

The breaking down of red blood cells in medically termed?

Accepted Answer

Answer reason: The medical term for breakdown (destruction) of red blood cells is haemolysis, which refers to rupture of the RBC membrane and release of hemoglobin into plasma. In contrast, erythropoiesis is the production of red blood cells in the bone marrow stimulated by erythropoietin. Therefore, the correct option is haemolysis.
Category reason: This question tests the physiological process/terminology related to red blood cell destruction versus production, which is a core concept in Physiology rather than a nursing intervention or clinical decision-making scenario.

Question 2

Earliest biochemical change in dehydration is?

Accepted Answer

Answer reason: In dehydration, the earliest change is reduction in plasma water volume, which increases the concentration of blood constituents (hemoconcentration), often reflected by rising hematocrit and serum total protein. Electrolyte abnormalities like hypo- or hypernatremia depend on the type of fluid loss and replacement and are not uniformly the earliest finding. Hypocalcemia and hypoglycemia are not typical early biochemical hallmarks of dehydration. Therefore, hemoconcentration is the best answer.
Category reason: This item tests the body’s physiologic response to fluid volume loss (changes in plasma volume and concentration), which is core Physiology rather than a nursing intervention or prioritization scenario.

Question 3

By what mechanism do lipid molecules cross cell membranes?

Accepted Answer

Answer reason: Lipid (nonpolar) molecules are soluble in the hydrophobic core of the phospholipid bilayer, so they typically move directly through the membrane by simple diffusion down their concentration gradient. Channel proteins and voltage-gated ion channels are primarily for ions or polar solutes that cannot pass through the lipid bilayer easily. Endocytosis/exocytosis is used for bulk transport of large particles or macromolecules, not for typical membrane passage of small lipids.
Category reason: The question tests the basic mechanism of movement of lipid molecules across the plasma membrane, a core concept of membrane transport physiology rather than a nursing care decision.

Question 4

Which of the following electrochemical mechanism is responsible for maintaining cell volume?

Accepted Answer

Answer reason: The Na+/K+ ATPase maintains low intracellular Na+ and high intracellular K+, creating an osmotic balance that prevents excess water from entering the cell. If this pump is inhibited, intracellular Na+ rises, water follows osmotically, and cells swell. Thus, it is the primary electrochemical mechanism that stabilizes cell volume under normal conditions. The other listed transporters do not provide the main baseline osmotic control across the plasma membrane.
Category reason: The question tests a foundational mechanism of membrane transport and osmotic homeostasis, which is a core concept in cellular physiology rather than a nursing intervention or clinical judgment scenario.

Question 5

The use of cryotherapy as a physical agent modality (PAM) is CONTRAINDICATED for clients who have which diagnoses?

Accepted Answer

Answer reason: Cryotherapy causes peripheral vasoconstriction and can markedly reduce blood flow to extremities. In Raynaud’s phenomenon, cold exposure triggers exaggerated vasospasm, increasing the risk of ischemia, pallor/cyanosis, pain, and potential tissue injury. Therefore cold modalities are contraindicated in Raynaud’s. In contrast, cryotherapy is commonly used for acute sprains and can be used for inflammatory tendon sheath conditions or trigger points depending on goals and tolerance.
Category reason: This question tests the physiologic effects of cold therapy on vascular regulation and peripheral circulation (vasoconstriction/vasospasm) rather than nursing prioritization or care-management decisions, fitting Physiology.

Question 6

.......... is required in the hepatic synthesis of prothrombin and the blood clotting factors and it's deficiency is observed in newborn infants?

Accepted Answer

Answer reason: Vitamin K is required for hepatic gamma-carboxylation of several coagulation factors, including prothrombin (factor II) and factors VII, IX, and X, enabling normal clot formation. Newborns are at risk of vitamin K deficiency because of low placental transfer, limited hepatic stores, and low vitamin K content in breast milk. This deficiency can lead to bleeding (vitamin K deficiency bleeding of the newborn), which is why prophylactic vitamin K is given at birth.
Category reason: The item tests a foundational body-function concept: the physiological role of vitamin K in hepatic synthesis/activation of clotting factors and the reason deficiency occurs in newborns.

Question 7

The brown color of the stool is due to the presence of?

Accepted Answer

Answer reason: The brown color of stool is primarily due to stercobilin, which is formed in the intestine from urobilinogen produced by bacterial conversion of bilirubin. Among the listed options, urobilinogen is the best match to this pathway and is the immediate precursor that is oxidized to the brown pigments in feces. Urobilin is mainly associated with yellow urine coloration, while bilirubin itself is further metabolized before contributing to stool color. Porphyrins are not responsible for the normal brown coloration of stool.
Category reason: This question tests normal pigment metabolism and excretion (bilirubin → urobilinogen → fecal pigments), which is a body function topic within Physiology rather than a nursing intervention or safety decision.

Question 8

The degradation of heme takes place in the ........... particularly in the liver and spleen

Accepted Answer

Answer reason: Heme from senescent red blood cells is primarily broken down by macrophages of the reticuloendothelial system (e.g., in the spleen and liver/Kupffer cells). These cells convert heme to biliverdin and then bilirubin via heme oxygenase and biliverdin reductase. Reticulocytes and circulating erythrocytes are not the main sites for heme degradation because RBCs lack the organelles/enzymes for this pathway and are removed and processed by macrophages.
Category reason: This question tests the physiologic site and process of heme catabolism (bilirubin formation) in the liver and spleen, which is a foundational body-function concept rather than a nursing intervention.

Question 9

The main cause of acidosis in dehydration is?

Accepted Answer

Answer reason: In dehydration due to diarrhea, there is significant loss of bicarbonate-rich intestinal fluid in stool, producing a normal anion gap (hyperchloremic) metabolic acidosis. Reduced circulating volume can also decrease renal perfusion, but the predominant and classic mechanism in diarrheal dehydration is direct bicarbonate loss. Protein breakdown is not the primary driver of acidosis in typical dehydration, and standard ORS is formulated to correct rather than cause acidosis. Kidney failure can cause metabolic acidosis, but it is not the main cause in routine dehydration.
Category reason: The question tests the physiologic mechanism of metabolic acidosis associated with dehydration (acid-base balance and bicarbonate loss), which is foundational body-function knowledge rather than a nursing intervention scenario.

Question 10

The removal of of a man's pancreas surgically can affect the digestion of?

Accepted Answer

Answer reason: The pancreas provides key digestive enzymes: pancreatic amylase for carbohydrates (starch), pancreatic lipase for fats, and proteases (e.g., trypsin/chymotrypsin) for proteins. Surgical removal of the pancreas (total pancreatectomy) eliminates exocrine secretions into the duodenum, causing global maldigestion. While other sources contribute (e.g., salivary amylase, gastric pepsin), pancreatic enzymes are essential for effective digestion of all three macronutrients, especially fats. Therefore digestion of starch, proteins, and fats is affected.
Category reason: This question tests the physiological role of pancreatic exocrine enzymes in digestion of macronutrients, which is foundational digestive physiology rather than a nursing intervention or clinical judgment scenario.

Question 11

What is the main function of red blood cells?

Accepted Answer

Answer reason: Red blood cells (erythrocytes) primarily transport oxygen from the lungs to tissues via hemoglobin binding. They also help carry some carbon dioxide back to the lungs, but oxygen transport is their main role. Blood clotting is mainly performed by platelets and clotting factors, and infection fighting is the role of white blood cells. Temperature regulation is primarily controlled by the hypothalamus and skin blood flow/sweating rather than RBCs.
Category reason: This item tests the physiologic function of a blood component (erythrocytes/hemoglobin) rather than a nursing intervention or clinical decision-making scenario, so it fits Physiology.

Question 12

Which of the following is not a reflex action?

Accepted Answer

Answer reason: Reflex actions are involuntary, automatic responses mediated by reflex arcs and autonomic/brainstem centers. Breathing, heart pumping, and salivation are primarily involuntary physiologic functions regulated automatically (though breathing can be voluntarily modulated). Movement of the hand is typically a voluntary somatic motor action initiated by the cerebral cortex rather than an automatic reflex, unless specifically described as a withdrawal reflex (which is not stated here). Therefore, the best answer is movement of hand.
Category reason: The item tests understanding of involuntary (reflex/autonomic) versus voluntary motor control, which is a foundational concept in physiology rather than a nursing care decision.

Question 13

A patient with fluid overload may have?

Accepted Answer

Answer reason: Fluid volume excess increases hydrostatic pressure in the vascular system, promoting fluid movement into interstitial spaces and causing peripheral edema. Excess intravascular volume can also lead to pulmonary congestion/edema, producing shortness of breath (often with crackles and possible orthopnea). Dry skin and low blood pressure are more consistent with fluid volume deficit, and increased urine output is not a typical finding in clinically significant overload (often urine output is decreased if renal/cardiac function is impaired).
Category reason: The question tests recognition of physiologic manifestations of hypervolemia (fluid volume excess) rather than nursing prioritization or an intervention, so it best fits foundational Physiology.

Question 14

What is the main function of white blood cells?

Accepted Answer

Answer reason: White blood cells (leukocytes) are the primary cells of the immune system responsible for defending the body against pathogens. They identify, attack, and help eliminate bacteria, viruses, parasites, and other foreign substances through innate and adaptive immune responses. In contrast, red blood cells transport oxygen and platelets are key for blood clotting, making “fighting infections” the best answer.
Category reason: The question tests the basic biological role of leukocytes in immunity, which is a foundational body-function concept under Physiology rather than a nursing care decision.

Question 15

Which of the following taste bud is present on the lateral sides of the tongue?

Accepted Answer

Answer reason: In the traditional (though oversimplified) “tongue map” taught in basic physiology, sour taste is emphasized on the lateral sides of the tongue. Sweet is classically placed at the tip, bitter at the posterior tongue, and salty on the anterolateral margins. Modern physiology recognizes taste receptors are distributed broadly, but for this MCQ the expected answer is sour on the lateral sides.
Category reason: This question tests the physiology of gustation (taste sensation distribution on the tongue), which is foundational body function knowledge rather than a nursing intervention or clinical judgment scenario.

Question 16

What is the normal range for adults respiratory Rate ..?

Accepted Answer

Answer reason: Normal resting respiratory rate for a healthy adult is typically 12–20 breaths per minute. Rates below this (e.g., 8–16) may include bradypnea, while higher ranges (16–24 or 20–30) trend toward tachypnea for many adults at rest. Therefore, 12–20 bpm best matches the standard adult vital sign reference range.
Category reason: The item tests recall of the normal adult respiratory rate, a basic vital-sign parameter describing normal body function, which is a core Physiology concept rather than a nursing intervention or prioritization scenario.

Question 17

Plasma protein which determines oncotic pressure is?

Accepted Answer

Answer reason: Albumin is the most abundant plasma protein and contributes the majority of plasma colloid (oncotic) pressure because of its high concentration and relatively low molecular weight. This oncotic pressure helps retain water within the intravascular space and counterbalances capillary hydrostatic pressure. Low serum albumin (e.g., liver disease, nephrotic syndrome, malnutrition) therefore predisposes to edema and third spacing. Other proteins like globulins and fibrinogen contribute less to overall oncotic pressure.
Category reason: The question tests the physiological basis of fluid balance and the specific plasma protein responsible for colloid oncotic pressure, which is core Physiology content rather than a nursing intervention scenario.

Question 18

Which organ is also known as the storehouse of vitamins?

Accepted Answer

Answer reason: The liver is commonly called the “storehouse of vitamins” because it stores several vitamins, especially fat-soluble vitamins (A, D, E, and K) and also vitamin B12. These hepatic reserves help maintain normal physiological functions during periods of low dietary intake. The kidney, spleen, and pancreas do not serve as primary storage sites for vitamins in the same way.
Category reason: This is a foundational question about organ function (vitamin storage), which is primarily studied under physiology rather than nursing interventions or clinical decision-making.

Question 19

During pregnancy, total blood volume increases by:

Accepted Answer

Answer reason: In normal pregnancy, plasma volume expands substantially, leading to an overall increase in total maternal blood volume of about 30–50%, peaking in the late 2nd to early 3rd trimester. This physiologic hypervolemia supports uteroplacental perfusion and prepares the mother for blood loss at delivery. The increase in plasma volume is proportionally greater than red cell mass expansion, contributing to physiologic (dilutional) anemia of pregnancy.
Category reason: The item tests a normal physiologic adaptation of pregnancy (maternal blood volume expansion) rather than a nursing intervention or prioritization decision, so it best fits Physiology.

Question 20

Which is the main component of blood?

Accepted Answer

Answer reason: Plasma is the largest portion of whole blood by volume (about 55%), consisting mostly of water plus proteins, electrolytes, nutrients, and waste products. The formed elements (RBCs, WBCs, and platelets) collectively make up the remaining ~45%, with RBCs being the largest formed element fraction but not the main overall component. Therefore, plasma is the main component of blood when considering total volume.
Category reason: This question tests the normal composition of blood (relative proportion of plasma vs formed elements), which is a foundational concept in how the circulatory system functions, aligning best with Physiology.

Question 21

Which part of the human brain controls the breathing rate?

Accepted Answer

Answer reason: The medulla oblongata in the brainstem contains the primary respiratory centers (dorsal and ventral respiratory groups) that generate and regulate the basic rhythm of breathing. It integrates chemoreceptor input related to CO2, pH, and oxygenation to adjust respiratory rate and depth. The pons modulates the pattern, but the medulla is the key controller of breathing rate among the options listed.
Category reason: This item tests foundational control of respiration by brainstem centers, which is a core body-function concept rather than a nursing intervention or clinical judgment scenario; therefore it fits Physiology.

Question 22

Average lifespan of RBC?

Accepted Answer

Answer reason: The average lifespan of a circulating red blood cell is about 120 days. As RBCs age, membrane flexibility decreases and they are removed primarily by macrophages in the spleen (and also liver). This normal turnover helps explain why disorders that increase hemolysis can shorten RBC survival and lead to anemia.
Category reason: This item tests a normal body-function fact about blood cell turnover and clearance, which is a foundational concept in physiology rather than a nursing intervention or clinical decision-making scenario.

Question 23

Which type of cell have limited regeneration in adults?

Accepted Answer

Answer reason: In adults, neurons (especially in the central nervous system) have very limited capacity to regenerate because mature neurons are largely post-mitotic and the CNS environment inhibits axonal regrowth (e.g., myelin-associated inhibitors and glial scar formation). In contrast, skin cells and many blood cell lineages regenerate rapidly via active stem cell pools. Muscle has some regenerative capacity (notably skeletal muscle via satellite cells), but overall is more limited than skin/blood and still not as classically "limited" as neurons in standard physiology teaching.
Category reason: The question tests foundational knowledge about cellular turnover and regenerative capacity of different tissues, which is a core concept in human physiology rather than a nursing intervention or clinical judgment scenario.

Question 24

The part of the brain responsible for peristalsis is?

Accepted Answer

Answer reason: Peristalsis is an involuntary visceral motor function regulated largely through autonomic reflexes coordinated in the brainstem, particularly via the vagus nerve nuclei. The medulla oblongata contains key autonomic control centers (e.g., dorsal motor nucleus of the vagus) involved in gastrointestinal motility. The thalamus is primarily a sensory relay, the hypothalamus mainly coordinates homeostasis/endocrine and autonomic outputs at a higher level, and the olfactory lobe is for smell rather than gut motility.
Category reason: This item tests understanding of autonomic control of gastrointestinal motility and brainstem function, which is foundational body-function content best classified under Physiology rather than nursing interventions or clinical judgment.

Question 25

Aging-related hearing changes result in older clients gradually losing their ability to hear

Accepted Answer

Answer reason: Age-related hearing loss (presbycusis) typically starts with reduced sensitivity to higher frequencies due to degeneration of cochlear hair cells and neural pathways. This makes it harder for older adults to hear high-pitched sounds and certain consonants, contributing to difficulty understanding speech, especially in noisy environments. Low-frequency hearing is usually preserved longer than high-frequency hearing. Therefore, the best answer is high-pitched sounds.
Category reason: The question tests an age-related change in auditory function (presbycusis), which is a normal body function change over time and belongs to Physiology rather than a nursing intervention or care-decision scenario.

Question 26

Antithrombin III inhibits:

Accepted Answer

Answer reason: Antithrombin III is a physiologic anticoagulant that inactivates several activated coagulation serine proteases, most notably thrombin (IIa) and factor Xa, and also inhibits other activated clotting factors in the intrinsic/common pathways. Because it broadly down-regulates the coagulation cascade, it is considered to inhibit activated factors including Xa and (via pathway inhibition) activated cofactors such as Va and VIIIa. This is why heparin therapy depends on adequate antithrombin III activity to exert its anticoagulant effect.
Category reason: The item tests foundational understanding of the coagulation cascade and endogenous anticoagulant regulation, which is a core body-function concept rather than a nursing intervention or prioritization scenario, fitting Physiology.

Question 27

Which finding is normal in a healthy newborn?

Accepted Answer

Answer reason: Acrocyanosis (bluish discoloration of hands and feet) is a common, normal transitional finding in healthy newborns during the first 24–48 hours due to peripheral vasomotor instability and improved systemic circulation after birth. In contrast, central cyanosis indicates inadequate oxygenation and is abnormal. Tachypnea with nasal flaring and expiratory grunting are signs of respiratory distress and suggest conditions such as transient tachypnea of the newborn or respiratory pathology.
Category reason: This item tests normal versus abnormal physiologic findings during the newborn’s cardiopulmonary transition after birth, which is primarily foundational physiology rather than a nursing intervention/prioritization scenario.

Question 28

Where is ribosomal RNA used in protein synthesis produced?

Accepted Answer

Answer reason: Ribosomal RNA (rRNA) is synthesized in the nucleolus, which is a specialized structure within the nucleus. The nucleus is a cellular organelle responsible for genetic control and ribosome production. Mitochondria, Golgi apparatus, and centrosomes do not produce rRNA.
Category reason: The question assesses foundational cellular physiology related to protein synthesis, which fits within the Physiology category under Nursing Science.

Question 29

The primary purpose of the Schilling test is to measure the client's ability to?

Accepted Answer

Answer reason: The Schilling test evaluates intestinal absorption of vitamin B12 by administering radiolabeled B12 and measuring urinary excretion. Low excretion indicates impaired B12 absorption, classically due to intrinsic factor deficiency (pernicious anemia) or malabsorption. It does not assess storage, digestion, or endogenous production of B12.
Category reason: This question tests the physiologic process of vitamin B12 absorption (and the diagnostic purpose of the Schilling test), which is foundational body-function knowledge rather than a nursing intervention or prioritization task.

Question 30

Which one is a functional unit of a body..?

Accepted Answer

Answer reason: The cell is the basic structural and functional unit of the human body, capable of carrying out essential life processes such as metabolism, growth, and response to stimuli. Mitochondria and cytoplasm are components within a cell and cannot function independently as the body’s fundamental unit. The spleen is an organ made up of many tissues and cells, so it is not the smallest functional unit.
Category reason: This question tests foundational knowledge about the basic functional unit of living organisms, which is core cell biology within physiology rather than nursing care decision-making.

Question 31

Blood consist of?

Accepted Answer

Answer reason: Blood is composed of a liquid component (plasma) and formed elements (blood cells: erythrocytes, leukocytes, and platelets). Plasma carries water, electrolytes, proteins (e.g., albumin, clotting factors), nutrients, and hormones. The cellular elements are suspended within plasma and are responsible for oxygen transport, immune defense, and hemostasis. Therefore, both blood cells and plasma are components of blood.
Category reason: The question tests foundational knowledge of the components of blood (plasma and formed elements), which is a basic body-function concept within physiology rather than a nursing care decision.

Question 32

What is the role of liver in glucose metabolism?

Accepted Answer

Answer reason: The liver plays a central role in maintaining blood glucose by storing excess glucose as glycogen (glycogenesis) after meals and releasing glucose by breaking down glycogen (glycogenolysis) during fasting. Among the options, glycogen storage is the most characteristic and directly tested liver function in glucose homeostasis. Insulin is produced by pancreatic beta cells, and glucose absorption primarily occurs in the small intestine. While glucose breakdown can occur in many tissues, the liver’s key regulatory role is glycogen storage and release.
Category reason: This question tests a foundational concept of how an organ regulates blood glucose levels, which is a normal body function topic within Physiology rather than a nursing intervention or safety decision.

Question 33

What percentage of the body's energy does the brain use?

Accepted Answer

Answer reason: In adults at rest, the brain accounts for about 20% of the body's total energy consumption despite being only ~2% of body weight. This reflects the high metabolic demand required to maintain neuronal membrane potentials and synaptic activity. Therefore, 20% is the best answer among the choices provided.
Category reason: The item tests a basic fact about organ energy utilization and metabolic demand, which is a core concept in human physiology rather than a nursing intervention or clinical judgment scenario.

Question 34

Your patient, Mrs. Level, is admitted for GI upset with severe dehydration, and you are monitoring her electrolytes and arterial blood gases as she is recovering. Which value would you expect to find if Mrs. Level was experiencing metabolic alkalosis?

Accepted Answer

Answer reason: Metabolic alkalosis is characterized by an elevated arterial pH (>7.45) due to increased serum bicarbonate (HCO3−). A pH of 7.48 indicates alkalemia and is consistent with metabolic alkalosis. By contrast, pH 7.32 indicates acidemia, and an HCO3 of 18 mEq/L is low (more consistent with metabolic acidosis). A pH of 7.35 is at the low end of normal and does not reflect alkalemia.
Category reason: The question tests interpretation of acid–base physiology (pH ranges and what constitutes alkalosis), which is foundational body-function knowledge rather than a nursing intervention decision.

Question 35

Bile helps in digestion of:

Accepted Answer

Answer reason: Bile primarily aids digestion of fats by emulsifying large fat globules into smaller droplets, which increases surface area for pancreatic lipase action. Bile salts also facilitate formation of micelles, improving absorption of fatty acids and fat-soluble vitamins (A, D, E, K) in the small intestine. It does not directly digest proteins, carbohydrates, or minerals via enzymatic breakdown.
Category reason: The question tests the function of bile in the digestive process, a normal body function under gastrointestinal physiology rather than a nursing intervention or prioritization task.

Question 36

Which organ detoxifies chemicals in the body?

Accepted Answer

Answer reason: The liver is the primary organ responsible for detoxifying many chemicals and drugs through hepatic metabolism (e.g., phase I and phase II reactions), converting lipid-soluble substances into more water-soluble forms. It also processes and inactivates endogenous compounds such as hormones and converts ammonia to urea. The kidneys primarily excrete filtered waste products in urine, and the bladder mainly stores urine, so they are not the main detoxification organ.
Category reason: This question tests basic organ function—detoxification and metabolic processing of chemicals—which is a foundational body function covered under Physiology rather than a nursing care decision.

Question 37

The micturition reflex center is located in the ________?

Accepted Answer

Answer reason: The basic micturition reflex is mediated by a spinal reflex arc located in the sacral spinal cord (S2–S4), which coordinates detrusor contraction and internal sphincter relaxation via parasympathetic outflow. Higher centers (pontine micturition center and cerebral cortex) modulate this reflex to allow voluntary control and coordinated voiding, but they are not the primary reflex center. The hypothalamus and medulla oblongata are not the key sites for the bladder reflex circuitry.
Category reason: This tests the neurophysiologic control of urination and the location of the reflex center, which is foundational body-function knowledge rather than a nursing intervention scenario, so it belongs to Physiology.

Question 38

What specie is most necessary for blood coagulation?

Accepted Answer

Answer reason: Calcium (factor IV) is an essential cofactor in multiple steps of the coagulation cascade, enabling activation and complex formation of several clotting factors on phospholipid surfaces. Without ionized calcium, key reactions in both intrinsic and extrinsic pathways cannot proceed effectively, impairing clot formation. This is why calcium chelators like citrate and EDTA prevent blood from clotting in collection tubes. The other listed ions are not required as universal cofactors for coagulation reactions.
Category reason: The question tests foundational understanding of the coagulation cascade and the physiologic role of ions (calcium as factor IV), which is core Physiology rather than a nursing intervention or prioritization scenario.

Question 39

Which electrolyte imbalance leads to Trousseau’s sign?

Accepted Answer

Answer reason: Trousseau’s sign (carpopedal spasm induced by inflating a blood pressure cuff) is a classic sign of neuromuscular irritability from hypocalcemia. Low ionized calcium lowers the threshold for nerve and muscle depolarization, predisposing to tetany. In contrast, hypokalemia more commonly causes muscle weakness and arrhythmias, hypernatremia causes cellular dehydration and neurologic symptoms, and hypermagnesemia depresses neuromuscular excitability rather than producing tetany.
Category reason: This item tests the physiologic effect of electrolyte abnormalities on neuromuscular excitability (tetany signs), which is foundational physiology rather than a nursing care action or priority-setting scenario.

Question 40

Respiration in cells occurs in:

Accepted Answer

Answer reason: Cellular (aerobic) respiration—especially the citric acid cycle and oxidative phosphorylation producing most ATP—occurs in the mitochondria. The nucleus primarily handles genetic material storage and transcription, and ribosomes perform protein synthesis. While glycolysis occurs in the cytoplasm, the standard exam answer for “respiration in cells” refers to mitochondrial aerobic respiration.
Category reason: This item tests where ATP-generating cellular respiration takes place within the cell, a core concept of cellular physiology rather than nursing care decisions.

Question 41

Q. 769: The first sound heard when measuring blood pressure is called?

Accepted Answer

Answer reason: In auscultatory blood pressure measurement, the first audible tapping sound (Korotkoff phase I) occurs when cuff pressure falls just below systolic arterial pressure, allowing turbulent blood flow to begin. This first Korotkoff sound is used to determine the systolic blood pressure. Diastolic pressure is typically identified at Korotkoff phase V, when the sounds disappear. Therefore, the first sound heard is Korotkoff's first sound.
Category reason: This item tests the physiologic basis of auscultatory blood pressure measurement and the meaning of Korotkoff sound phases, which is foundational cardiovascular physiology rather than a nursing judgment/action prioritization scenario.

Question 42

Which acid helps in digestion in the stomach?

Accepted Answer

Answer reason: Hydrochloric acid (HCl) is secreted by gastric parietal cells and is the primary acid in the stomach. It denatures proteins and provides the low pH needed to convert pepsinogen to pepsin, facilitating protein digestion. It also helps kill ingested microorganisms. The other options are not physiological gastric acids (NaOH is a base; H2SO4 and HNO3 are not produced for digestion).
Category reason: This question tests basic body function—identifying the normal gastric acid involved in digestion—so it falls under Physiology rather than nursing interventions or clinical judgment.

Question 43

Which of the following control breathing rate in humans?

Accepted Answer

Answer reason: The primary respiratory control centers that set the basic rhythm and rate of breathing are located in the medulla oblongata (e.g., dorsal and ventral respiratory groups). These medullary centers integrate input from chemoreceptors responding to CO2/pH and oxygen levels and adjust ventilation accordingly. The cerebellum coordinates movement, the thalamus relays sensory information, and the hypothalamus influences autonomic functions but does not directly generate the breathing rhythm.
Category reason: This is a foundational question about physiologic control of ventilation by brainstem respiratory centers, which is core Physiology rather than a nursing care/judgment scenario.

Question 44

Which Organ Regenerates Itself?

Accepted Answer

Answer reason: The liver has a unique capacity for regeneration through compensatory hyperplasia, allowing remaining hepatocytes to proliferate after injury or partial hepatectomy. This is why living-donor liver transplantation is possible and why substantial liver tissue can be removed with subsequent recovery of functional mass. In contrast, kidneys and lungs have limited regenerative ability and typically heal primarily through repair/scarring rather than restoring lost organ tissue.
Category reason: This tests a foundational concept about organ regenerative capacity, which is a normal functional property of body systems and is best classified under physiology rather than a nursing care decision.

Question 45

Which organ is also called the “Blood Bank”?

Accepted Answer

Answer reason: The spleen is often termed the “blood bank” because it serves as a reservoir for blood, especially storing platelets and some red blood cells, and can contract to release them into circulation when needed (e.g., hemorrhage). It also filters aged or damaged RBCs and participates in immune surveillance of blood-borne pathogens. The kidney primarily regulates fluid/electrolytes and erythropoietin, the liver synthesizes clotting factors and proteins, and the heart pumps blood but does not store it as a reserve.
Category reason: This item tests a foundational concept about organ function (blood storage/reservoir and filtration), which is a physiology topic rather than a nursing intervention or clinical decision-making scenario.

Question 46

Which electrolyte imbalance is associated with Chvostek’s sign?

Accepted Answer

Answer reason: Chvostek’s sign (facial muscle twitching when tapping the facial nerve) indicates neuromuscular irritability due to low ionized calcium. Hypocalcemia lowers the threshold for nerve depolarization, leading to tetany signs such as Chvostek’s and Trousseau’s. The other listed electrolyte abnormalities are not classically associated with this facial nerve hyperexcitability finding.
Category reason: The item tests recognition of a classic physical sign and its underlying electrolyte physiology (calcium’s role in neuromuscular excitability), which is foundational biomedical knowledge rather than a nursing intervention/prioritization scenario.

Question 47

Where is bile produced?

Accepted Answer

Answer reason: Bile is synthesized and secreted by hepatocytes in the liver. The gallbladder does not produce bile; it stores and concentrates bile and releases it into the duodenum in response to meals (via CCK). The pancreas produces digestive enzymes and bicarbonate, not bile, and the stomach produces acid and intrinsic factor rather than bile.
Category reason: This question tests where a digestive secretion is generated, which is a normal body-function concept (bile production and storage) and therefore belongs to Physiology.

Question 48

Which part of the Ear detects sound?

Accepted Answer

Answer reason: The cochlea contains the organ of Corti with hair cells that transduce mechanical sound vibrations into electrical nerve impulses, which is the actual detection of sound. The auditory canal and eardrum primarily conduct and transmit sound waves/vibrations toward the middle and inner ear. The ileum is part of the gastrointestinal tract and is not involved in hearing.
Category reason: This question tests how a sensory organ converts sound vibrations into neural signals, which is a core concept in human physiology rather than nursing care decision-making.

Question 49

Oral Rehydration Solution (ORS) mainly corrects:

Accepted Answer

Answer reason: ORS is formulated with glucose and electrolytes (especially sodium and potassium) to enhance intestinal sodium-glucose cotransport, which pulls water back into the body. Therefore, it primarily corrects dehydration by replacing lost water and electrolytes from conditions like diarrhea and vomiting. It is not designed to treat protein or vitamin deficiencies. While ORS can help improve associated metabolic acidosis (via citrate/bicarbonate precursors), it does not correct an acid–base problem "only" and its main effect is fluid-electrolyte replacement.
Category reason: The question tests the mechanism and primary physiologic effect of ORS on body fluid and electrolyte balance rather than nursing actions or prioritization, fitting foundational Physiology.

Question 50

The lack of oxygen in the tissue is called?

Accepted Answer

Answer reason: Lack of oxygen at the tissue level is termed anoxia when there is a complete absence of oxygen delivery/utilization. Hypoxia refers to decreased (but not absent) oxygen in tissues. Cyanosis is a clinical sign (bluish discoloration) due to increased deoxygenated hemoglobin and is not the term for the underlying tissue oxygen deficiency. Anorexia refers to loss of appetite and is unrelated.
Category reason: This item tests terminology and concepts about tissue oxygenation states (anoxia vs hypoxia), which are foundational physiologic concepts rather than a nursing intervention or prioritization scenario.

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