Question 1

Maximum weight of our body is made up of...?

Accepted Answer

Answer reason: In a typical adult, water makes up the largest proportion of body mass (about 50–60%, varying with age, sex, and body fat). This percentage is greater than the mass contribution of bones, skin, or individual organs. Therefore, the maximum weight component of the body is water.
Category reason: This item tests basic composition of the human body (total body water as a proportion of body weight), which is a foundational concept in physiology rather than a nursing intervention or clinical decision.

Question 2

First sign of puberty in boys is?

Accepted Answer

Answer reason: In boys, the earliest clinical sign of puberty is testicular enlargement (increase in testicular volume), reflecting activation of the hypothalamic–pituitary–gonadal axis and rising gonadotropins/testosterone. Other changes such as voice deepening and facial hair growth typically occur later as androgen effects progress. The peak growth spurt also occurs after initial gonadal enlargement rather than being the first sign.
Category reason: This question tests the normal physiologic sequence of male pubertal development, which is a foundational body-function concept rather than a nursing intervention or safety decision.

Question 3

A patient presents to the clinic for a routine visit and has the following vital signs: temperature 37.00C (98.60F), heart rate 82, respiration rate 18 and blood pressure level of 130/94 mmHg. Which vital sign is abnormal?

Accepted Answer

Answer reason: Normal adult ranges include temperature ~36.5–37.5°C, heart rate 60–100 bpm, and respiratory rate 12–20/min, so 37°C, 82 bpm, and 18/min are within expected limits. A blood pressure of 130/94 mmHg is abnormal because the diastolic value (94) is elevated (≥90 mmHg), consistent with hypertension. Among the listed vital signs, blood pressure is the only one outside normal adult parameters.
Category reason: This item tests knowledge of normal adult vital-sign ranges and interpretation of an elevated blood pressure reading, which is a foundational body-function concept within physiology rather than a nursing-intervention decision.

Question 4

Haemoglobin contains:

Accepted Answer

Answer reason: Hemoglobin is a conjugated protein made of globin chains (protein) and heme groups. Each heme contains an iron (Fe2+) atom that reversibly binds oxygen, enabling oxygen transport in blood. Calcium, sodium, and zinc are not the central metal in the heme moiety responsible for oxygen binding.
Category reason: This question tests the basic composition and function of hemoglobin in oxygen transport, which is foundational blood/respiratory physiology rather than a nursing care decision.

Question 5

Which organ releases erythropoietin in response to hypoxia?

Accepted Answer

Answer reason: The kidneys are the primary site of erythropoietin (EPO) production in adults, released by renal interstitial fibroblast-like cells when oxygen tension falls. Hypoxia activates hypoxia-inducible factor (HIF), which increases EPO gene transcription. EPO then stimulates erythropoiesis in the bone marrow to raise the red blood cell mass and improve oxygen delivery. The liver can produce some EPO (especially in fetal life), but it is not the main adult source.
Category reason: This question tests the physiological control of erythropoiesis and the organ response to hypoxia, which is a foundational body-function concept rather than a nursing intervention or prioritization scenario.

Question 6

Which vitamins essential for blood clotting?

Accepted Answer

Answer reason: Vitamin K is required for hepatic gamma-carboxylation of clotting factors II (prothrombin), VII, IX, and X, as well as proteins C and S, which enables them to bind calcium and function in the coagulation cascade. Deficiency leads to impaired clot formation and bleeding tendency with prolonged PT/INR. Vitamins A, D, and most B vitamins do not have this primary role in coagulation factor activation.
Category reason: The question tests foundational knowledge of the physiologic requirement for coagulation factor activation, which falls under Physiology rather than nursing care decision-making.

Question 7

Male ejaculation usually occurs during which phase of the sexual response cycle?

Accepted Answer

Answer reason: The sexual response cycle progresses through excitement, plateau, orgasm, and resolution. In males, ejaculation is a hallmark event of the orgasm phase, occurring with rhythmic contractions of the reproductive tract and pelvic floor muscles. The plateau phase represents sustained high arousal prior to orgasm, while the resolution phase is the return to baseline physiology after orgasm and ejaculation.
Category reason: This question tests normal function of the human sexual response cycle (timing of ejaculation within physiologic phases), which is core Physiology rather than nursing care decision-making.

Question 8

Which enzyme is responsible for the digestion of milk in infants ?

Accepted Answer

Answer reason: In infants, rennin (chymosin) is a gastric enzyme that coagulates milk casein into curds, allowing milk to be retained longer in the stomach and digested more effectively. This is especially relevant in early life when milk is the primary food. Pepsin and trypsin are proteases that digest proteins more generally, but rennin is specifically associated with milk (casein) coagulation in infants. Therefore, rennin is the best answer.
Category reason: The question tests a foundational concept of digestive enzyme function in infancy (milk/casein digestion), which is a normal body process studied under Physiology rather than nursing care decision-making.

Question 9

Fever is caused by?

Accepted Answer

Answer reason: Fever is a regulated rise in the hypothalamic temperature set point triggered by pyrogens released during infection and inflammation. Viral and bacterial pathogens commonly induce this response via cytokines (e.g., IL-1, IL-6, TNF-α) and prostaglandin E2. Therefore, both viruses and bacteria (types of infection) can cause fever, making the most inclusive and correct option "All of the above.
Category reason: The item tests the biologic mechanism/etiology of fever as a physiologic response to infection rather than a nursing intervention or prioritization decision, so it fits foundational Physiology content.

Question 10

Which of the following vitamins helps in blood clotting?

Accepted Answer

Answer reason: Vitamin K is required for hepatic gamma-carboxylation of several coagulation proteins, enabling them to bind calcium and function properly in the clotting cascade. It is essential for synthesis/activation of factors II, VII, IX, and X as well as proteins C and S. Deficiency leads to impaired coagulation and increased bleeding tendency, which is why vitamin K supports normal blood clotting.
Category reason: The question tests foundational understanding of how vitamins support normal body function—specifically the physiology of hemostasis and coagulation factor activation—rather than a nursing care action or prioritization decision.

Question 11

What is the normal pH of human blood?

Accepted Answer

Answer reason: Normal arterial blood pH is tightly regulated within the narrow range of 7.35–7.45 by respiratory control of CO2 and renal handling of bicarbonate. Values below 7.35 indicate acidemia and above 7.45 indicate alkalemia, both of which can impair cellular function and enzyme activity. The other ranges listed are either markedly acidotic or excessively alkalotic and are not compatible with normal human physiology.
Category reason: This question tests the normal physiologic set point for blood acid–base balance, a core concept in human homeostasis and buffering systems, which falls under Physiology.

Question 12

Which part of the skin is most sensitive to touch?

Accepted Answer

Answer reason: Touch sensitivity depends largely on the density of cutaneous mechanoreceptors and the size of receptive fields. Glabrous skin of the hand (including the palm and fingertips) has a much higher concentration of tactile receptors (e.g., Meissner corpuscles, Merkel discs) than areas like the back, elbow, or knee. This results in better two-point discrimination and greater sensitivity to light touch. Among the listed options, the palm is therefore the most sensitive.
Category reason: The question tests sensory receptor distribution and tactile acuity (mechanoreception) rather than nursing care actions, which is a foundational body-function concept in Physiology.

Question 13

Hyperventilation causes?

Accepted Answer

Answer reason: Hyperventilation increases alveolar ventilation, which lowers arterial CO2 (hypocapnia). Because CO2 is an acid in the bicarbonate buffer system, a drop in PaCO2 raises blood pH, producing respiratory alkalosis. Acidosis is more consistent with hypoventilation/CO2 retention, while hypoxia and anemia are not direct acid–base consequences of hyperventilation.
Category reason: This item tests the physiologic effect of altered ventilation on CO2 and acid–base balance, which is a core concept in respiratory physiology.

Question 14

Which organ is called the "River of Life"?

Accepted Answer

Answer reason: Blood is commonly termed the "river of life" because it continuously circulates through the body, delivering oxygen, nutrients, and hormones to tissues and removing carbon dioxide and metabolic wastes. This constant flow supports cellular metabolism and maintains homeostasis. The brain and heart are vital organs but are not traditionally referred to by this phrase, and "Lymy" is not a standard anatomical term.
Category reason: The question tests a foundational concept about the role of blood circulation in sustaining life, which is primarily a Physiology topic rather than a nursing care decision.

Question 15

Urea formation in body occur in.

Accepted Answer

Answer reason: Urea is synthesized in the liver via the urea (ornithine) cycle to detoxify ammonia produced during amino acid metabolism. The kidneys primarily excrete urea in urine but do not form it. The pancreas and intestine are not the primary sites of urea synthesis in normal human physiology.
Category reason: This question tests where a metabolic waste product (urea) is produced via a normal biochemical pathway, which is a core concept of human physiology rather than nursing intervention/priority setting.

Question 16

PH of human blood is?

Accepted Answer

Answer reason: Normal arterial blood pH is tightly regulated around 7.35–7.45, which is slightly alkaline. Among the given choices, “7-8” best captures this physiologic range, while 6 or 4 would indicate severe acidosis incompatible with normal function and 9 would be extreme alkalosis. The body maintains pH via buffer systems (bicarbonate), respiratory CO2 regulation, and renal acid-base control.
Category reason: This tests the normal acid–base value of blood and homeostatic regulation, which is a core concept of human physiology rather than a nursing intervention or clinical decision-making scenario.

Question 17

Which is the most radiosensitive organ?

Accepted Answer

Answer reason: Radiosensitivity is highest in tissues with rapidly dividing, less-differentiated cells. Lymphoid tissue contains many proliferating lymphocytes and is highly susceptible to radiation-induced DNA damage, leading to cell death and immunosuppression. By contrast, brain tissue has low mitotic activity and is relatively radioresistant, and kidney/bone (as whole organs) are less radiosensitive than lymphoid tissue.
Category reason: This is a foundational question about how different body tissues respond to ionizing radiation based on cellular proliferation and differentiation, which fits basic human physiology rather than a nursing-care decision or intervention.

Question 18

Percentage of salt present in the human body is?

Accepted Answer

Answer reason: Total body fluid has an osmolarity equivalent to approximately 0.9% sodium chloride (normal saline), which is isotonic with human plasma. This reflects the typical salt concentration that maintains normal cellular volume and fluid balance across membranes. Lower percentages would be hypotonic and higher would be hypertonic relative to plasma, making 0.9% the best match among the options.
Category reason: This question tests knowledge of normal salt concentration/osmotic equivalence in body fluids, which is a foundational concept in body fluid physiology rather than a nursing intervention or clinical prioritization task.

Question 19

Which of the following is the primary function of red blood cells?

Accepted Answer

Answer reason: Red blood cells primarily transport oxygen from the lungs to tissues via hemoglobin binding and release based on tissue oxygen needs. They also help carry carbon dioxide back to the lungs, but oxygen transport is their main role. Fighting infection is primarily the function of white blood cells, hormone production is endocrine organ function, and blood pressure regulation is mainly mediated by cardiac output, vascular tone, kidneys, and hormones.
Category reason: This item tests the normal body function of erythrocytes (oxygen transport via hemoglobin), which is a foundational concept in physiology rather than a nursing intervention or prioritization scenario.

Question 20

Which mineral is essential for blood clotting?

Accepted Answer

Answer reason: Calcium (factor IV) is required at multiple steps of the coagulation cascade, enabling activation of vitamin K–dependent clotting factors (II, VII, IX, X) on phospholipid surfaces. Without adequate ionized calcium, coagulation reactions are impaired and clot formation is delayed. Iron is primarily for hemoglobin and oxygen transport, while sodium and potassium are mainly involved in fluid balance and neuromuscular/cardiac excitability rather than coagulation.
Category reason: The item tests foundational understanding of the coagulation process and the role of minerals in the clotting cascade, which is a normal body function studied under Physiology rather than a nursing intervention or prioritization scenario.

Question 21

Which is the anti-coagulant Substance in blood?

Accepted Answer

Answer reason: Heparin is a physiologic anticoagulant present in the body that enhances antithrombin III activity, thereby inhibiting thrombin (factor IIa) and factor Xa and reducing clot formation. In contrast, fibrinogen is a clotting substrate that is converted to fibrin, and thrombin is a key procoagulant enzyme that drives clot formation. Globin is a protein component of hemoglobin and has no anticoagulant role.
Category reason: The item tests foundational knowledge of blood coagulation components and endogenous anticoagulants, which is a core concept in physiology rather than a nursing judgment/intervention scenario.

Question 22

Which hormone raises blood pressure?

Accepted Answer

Answer reason: Adrenaline (epinephrine) raises blood pressure by stimulating alpha-1 adrenergic receptors to cause vasoconstriction, which increases systemic vascular resistance. It also stimulates beta-1 receptors in the heart, increasing heart rate and contractility, thereby increasing cardiac output. Together these effects elevate both systolic and (often) diastolic blood pressure, especially during the fight-or-flight response.
Category reason: The question tests the physiologic effect of hormones on cardiovascular hemodynamics (vasoconstriction and cardiac stimulation), which is a foundational Physiology concept rather than a nursing intervention/priority decision.

Question 23

Pitting edema is identified as__________.?

Accepted Answer

Answer reason: Pitting edema is characterized by an indentation that persists after pressing on swollen tissue, reflecting displacement of interstitial fluid. This is typically assessed over bony prominences such as the shin or ankle. Discoloration, warmth/redness, or pain can occur with other conditions (e.g., inflammation, cellulitis, DVT) but are not the defining feature of pitting edema. Therefore, the persistent depression on pressure is the best identifier.
Category reason: The question tests the defining physical sign and mechanism of pitting edema (fluid accumulation and tissue response to pressure), which is a foundational physiologic concept rather than a nursing management decision.

Question 24

Normal Fetal Heart Rate is ??

Accepted Answer

Answer reason: The normal baseline fetal heart rate is generally 110–160 beats per minute, and many nursing/OB references summarize this as 120–160 b/min. Values below this range suggest fetal bradycardia and may indicate hypoxia or other fetal compromise, while persistently higher values suggest tachycardia. Among the options, 120–160 b/min is the only range that matches the accepted normal fetal baseline.
Category reason: This item tests recall of the normal fetal heart rate range (a physiologic parameter) rather than nursing interventions or prioritization, so it best fits Physiology under NursingScience.

Question 25

Which enzyme is present in saliva?

Accepted Answer

Answer reason: Saliva contains salivary amylase (ptyalin), which begins carbohydrate digestion by hydrolyzing starch into smaller sugars such as maltose and dextrins. Pepsin is a gastric enzyme active in the stomach, and trypsin is a pancreatic protease that acts in the small intestine. While some lipase activity can occur in the oral cavity (lingual lipase), the classic enzyme tested as present in saliva is amylase.
Category reason: This question tests knowledge of digestive enzymes and where they are produced/active, which is a foundational body-function topic in Physiology rather than a nursing care decision.

Question 26

The most important factor for bone healing:

Accepted Answer

Answer reason: Adequate blood supply is the key determinant of fracture healing because it delivers oxygen, nutrients, inflammatory/repair cells, and growth factors needed for callus formation and remodeling. Poor perfusion (e.g., severe soft-tissue injury, vascular disease, smoking) is strongly associated with delayed union and nonunion. Immobilization, nutrition, and age affect healing, but none can compensate for inadequate vascularity at the fracture site.
Category reason: This item tests the physiologic determinant of tissue repair (fracture healing) rather than a nursing action, so it fits foundational Physiology.

Question 27

The main sugar absorbed in intestine is?

Accepted Answer

Answer reason: The small intestine primarily absorbs monosaccharides, and glucose is the major end-product of carbohydrate digestion and the predominant monosaccharide transported into enterocytes. Sucrose and lactose are disaccharides that must be broken down by brush-border enzymes before absorption. While fructose is also absorbed, glucose is the main sugar absorbed and is transported efficiently via sodium-dependent mechanisms (SGLT1).
Category reason: This question tests normal digestive absorption and transport of carbohydrates in the intestine, which is a core topic in human physiology rather than nursing interventions or clinical decision-making.

Question 28

Capacity of Stomach in Newborn..?

Accepted Answer

Answer reason: A term newborn’s gastric capacity is small, commonly taught as about 20–30 mL (approximately 1 oz) in the first day of life, increasing over the first week. Among the provided choices, 30 mL best matches standard neonatal physiology references for initial stomach capacity. Larger volumes such as 50 mL or 100 mL are more consistent with older infants rather than immediate newborns. This small capacity supports frequent, smaller feeds in the early neonatal period.
Category reason: The question tests normal newborn stomach capacity, a foundational concept about gastrointestinal function and volume handling rather than a nursing intervention or prioritization scenario, so it fits Physiology.

Question 29

Average Heat beat per Minute In a Normal Person is..................?

Accepted Answer

Answer reason: The average resting heart rate for a healthy adult is commonly taught as about 72 beats per minute. While the normal adult resting range is broader (about 60–100 bpm), 72 bpm is the classic average value used in physiology and nursing fundamentals. 50 bpm would be bradycardic for many adults, and 100 bpm is at the upper limit of normal rather than the average. Therefore, 72 beats/min is the best answer.
Category reason: This item tests knowledge of normal resting heart rate values, which is a foundational concept in human body function and vital signs, fitting Physiology rather than clinical nursing decision-making.

Question 30

Exchange of gases occurs in:

Accepted Answer

Answer reason: Gas exchange between blood and tissues (and between alveoli and blood) occurs across thin, permeable capillary walls by diffusion down partial-pressure gradients. Capillaries provide a very large surface area and have a single-cell-thick endothelium, making them ideal for exchange. Arteries, veins, and the aorta have thicker walls designed for transport and pressure regulation rather than diffusion.
Category reason: This question tests the physiological site and mechanism of gas exchange in the circulatory system, which is a core concept in Physiology rather than a nursing intervention or safety decision.

Question 31

Which of the following primitive reflexes would persist throughout life?

Accepted Answer

Answer reason: Most primitive (infant) reflexes integrate/disappear as the central nervous system matures: the Moro reflex typically fades by about 4–6 months, the rooting reflex by about 3–4 months, and the palmar grasp by about 5–6 months. The parachute reflex develops later (around 8–9 months) as a protective extension response. Unlike the transient primitive reflexes, the parachute response normally persists throughout life as a protective mechanism against falls.
Category reason: The question tests knowledge of normal reflex development and persistence across the lifespan, which is a foundational concept in neurodevelopmental physiology rather than a nursing intervention or prioritization scenario.

Question 32

Which of the following is the Antagonist to the prostacyclin?

Accepted Answer

Answer reason: Prostacyclin (PGI2), produced by vascular endothelium, causes vasodilation and inhibits platelet aggregation. Thromboxane A2 (TXA2), produced primarily by platelets, has the opposite effects—vasoconstriction and promotion of platelet aggregation—making it the functional antagonist of prostacyclin. Myosin and actin are contractile proteins and are not eicosanoid antagonists. Phospholipase A2 is an upstream enzyme in arachidonic acid release, not an opposing mediator to PGI2.
Category reason: The item tests the opposing physiological roles of eicosanoids (prostacyclin vs thromboxane) in vascular tone and platelet aggregation, which is a core concept in physiology rather than nursing interventions or patient-care decision-making.

Question 33

Oxygen is carried by?

Accepted Answer

Answer reason: Most oxygen in blood is transported bound to hemoglobin within red blood cells as oxyhemoglobin, which greatly increases the blood’s oxygen-carrying capacity. Only a small fraction of oxygen is dissolved directly in plasma. White blood cells and platelets do not function in oxygen transport; they are primarily involved in immunity and clotting, respectively.
Category reason: This question tests a core concept of how oxygen is transported in the body, which is a fundamental respiratory/circulatory physiology topic rather than a nursing care decision.

Question 34

The final product of respiration is?

Accepted Answer

Answer reason: Cellular respiration is the metabolic process that converts energy stored in nutrients (e.g., glucose) into usable cellular energy in the form of ATP. While carbon dioxide and water are waste end-products of aerobic respiration, the key functional “final product” for the cell is ATP. DNA, protein, and fat are biomolecules that are synthesized or stored, not the primary energy currency produced by respiration. Therefore, ATP is the best answer.
Category reason: The question tests foundational understanding of cellular energy production and what respiration yields, which is a core concept in physiology rather than a nursing intervention or patient-care decision.

Question 35

The element needed to make make bones strong is?

Accepted Answer

Answer reason: Calcium is the primary mineral deposited in bone as hydroxyapatite (a calcium-phosphate crystal), which provides rigidity and strength. Adequate calcium is essential for normal bone mineralization and maintenance of bone density. Iron is mainly for hemoglobin/oxygen transport, sodium is an electrolyte for fluid/nerve function, and zinc supports enzyme activity and growth but is not the main structural mineral for bone strength.
Category reason: The question tests foundational knowledge of which mineral contributes to bone strength and mineralization, which is primarily a physiology topic rather than a nursing care decision.

Question 36

Fever is defined as a body temperature above?

Accepted Answer

Answer reason: Fever (pyrexia) is commonly defined clinically as a core body temperature of 38°C (100.4°F) or higher. Normal oral temperature averages around 37°C (98.6°F) with expected diurnal variation, so 37.5°C is not typically classified as fever. Higher values such as 38.9°C and above reflect more significant fever but are not the threshold definition. Therefore the best cutoff listed is 100.4°F (38°C).
Category reason: The question tests the physiologic definition/threshold of fever in terms of body temperature, which is a foundational concept in thermoregulation rather than a nursing intervention or prioritization scenario.

Question 37

Most abundant mineral in body?

Accepted Answer

Answer reason: Calcium is the most abundant mineral in the human body, with about 99% stored in bones and teeth as hydroxyapatite. The remaining small fraction is in extracellular fluid and cells, where it is essential for neuromuscular excitability, blood coagulation, and intracellular signaling. Compared with sodium, magnesium, and iron, total body content of calcium is greatest due to skeletal storage.
Category reason: This is a foundational question about body composition and mineral distribution, which is primarily covered under human physiology rather than nursing interventions or clinical decision-making.

Question 38

Fluid compartment of blood is...?

Accepted Answer

Answer reason: The fluid portion of blood is plasma, which contains water, electrolytes, proteins (albumin, globulins, fibrinogen), nutrients, hormones, and waste products. Formed elements (RBCs, WBCs, platelets) are suspended within plasma. Lymph is a separate fluid in the lymphatic system, and while blood is part of extracellular fluid, the specific blood fluid compartment is plasma.
Category reason: This tests a foundational concept of body fluid compartments and the composition of blood, which is core Physiology rather than nursing interventions or clinical prioritization.

Question 39

The pH level of normal stomach acid is?

Accepted Answer

Answer reason: Normal gastric acid is primarily hydrochloric acid secreted by parietal cells, producing a highly acidic gastric lumen. Fasting gastric pH is typically around 1–2, which helps denature proteins and activate pepsin from pepsinogen. A pH of 2–3 can occur after meals due to buffering, but the classic normal stomach acid level is 1–2.
Category reason: This question tests foundational knowledge of normal gastric acidity and digestive function, which is a core concept in human physiology rather than a nursing intervention or clinical decision-making scenario.

Question 40

Maximum development of the brain occurs at?

Accepted Answer

Answer reason: The most rapid brain growth and development occurs in early childhood, particularly from birth through about 5 years, when synaptogenesis and myelination are highly active and the brain reaches a large proportion of its adult size. While the 3rd trimester is important for fetal brain growth, the peak postnatal rate of neurodevelopment and brain volume increase occurs in the first years of life. Later childhood and adolescence involve continued maturation (e.g., pruning and frontal lobe development) but not the maximum overall developmental rate.
Category reason: This question tests knowledge of when brain growth and maturation are most rapid across the lifespan, which is a foundational concept about human body development and function rather than a nursing intervention or clinical decision.

Question 41

The 'Blood bank of the body is'?

Accepted Answer

Answer reason: The spleen functions as a reservoir for blood, particularly storing and releasing red blood cells and platelets as needed, which is why it is referred to as the body's “blood bank.” It also filters aged or damaged erythrocytes and participates in immune surveillance. The liver has major metabolic and detoxification roles, the heart pumps blood, and the kidney regulates fluid/electrolytes and produces erythropoietin, but none primarily serve as a blood reservoir.
Category reason: This is a foundational question about organ function (blood storage/reservoir role of the spleen), which is a body function concept best classified under Physiology rather than nursing care decision-making.

Question 42

Severe dehydration in an infant is characterized by?

Accepted Answer

Answer reason: Severe dehydration in infants commonly presents with signs of significant volume depletion and poor perfusion, including lethargy, sunken eyes, and decreased skin turgor. These findings reflect reduced interstitial fluid and impaired tissue hydration. Increased urination, increased salivation/sweating, and normal activity with mild thirst are inconsistent with severe dehydration, where urine output typically decreases and the child appears ill.
Category reason: This item primarily tests recognition of physiologic manifestations of fluid volume deficit (dehydration severity signs) rather than a nursing intervention, prioritization, or safety decision, so it fits foundational Physiology.

Question 43

Which of the following enzymes is responsible for the initial digestion of carbohydrates in the mouth?

Accepted Answer

Answer reason: Carbohydrate digestion begins in the mouth due to salivary amylase (ptyalin), which hydrolyzes starch into smaller polysaccharides and maltose. Pepsin and trypsin are proteolytic enzymes that digest proteins (pepsin in the stomach; trypsin in the small intestine). Lipase primarily digests fats and is not responsible for the initial digestion of carbohydrates in the mouth.
Category reason: The question tests normal digestive enzyme function and where digestion begins in the GI tract, which is a core Physiology concept rather than a nursing intervention or prioritization scenario.

Question 44

Human Brain uses approx. how much of the body's total energy?

Accepted Answer

Answer reason: In adults, the brain accounts for about 2% of body weight but consumes roughly 20% of the body's resting energy and oxygen due to continuous neuronal activity and maintenance of ion gradients. This high metabolic demand is why interruption of cerebral blood flow rapidly leads to neurologic dysfunction. Among the options, 20% is the standard approximate value taught in physiology.
Category reason: The question tests a basic physiologic fact about organ energy consumption and resting metabolic demand, not nursing interventions or clinical decision-making; therefore it best fits Physiology.

Question 45

A patient with hypokalemia might show:

Accepted Answer

Answer reason: Hypokalemia increases neuromuscular irritability and impairs normal muscle cell repolarization, commonly causing muscle weakness and cramps. ECG findings of hypokalemia are classically flattened/inverted T waves and prominent U waves, not tall peaked T waves (which suggest hyperkalemia). A bounding pulse is more consistent with high-output states or fluid overload rather than low potassium. Bradypnea is not a typical primary sign of hypokalemia.
Category reason: This item tests physiologic effects of low serum potassium on neuromuscular and cardiac function, which is foundational body-function knowledge rather than a nursing intervention or prioritization scenario.

Question 46

Poisonous cells containing glands are present in?

Accepted Answer

Answer reason: Amphibians commonly have specialized skin glands (granular/poison glands) that contain toxin-producing cells used for defense. These poisonous secretions can be released through the skin when the animal is threatened. While some fishes, birds, and mammals can be venomous or toxic, the classic presence of poison glands in the skin is characteristic of amphibians (e.g., frogs, toads, salamanders). Therefore, amphibians are the best answer.
Category reason: This question tests a general biological concept about integumentary gland function and defensive secretions in vertebrate groups, which is aligned with foundational physiology rather than nursing care decision-making.

Question 47

CSF (Cerebrospinal Fluid) pressure depends primarily on

Accepted Answer

Answer reason: CSF pressure is primarily determined by the balance between CSF production and, most importantly, CSF absorption through the arachnoid villi/granulations into the venous system. When absorption is impaired (e.g., communicating hydrocephalus), CSF accumulates and intracranial pressure rises even if formation is unchanged. CSF formation is relatively constant, so variations in absorption are the key driver of sustained CSF pressure changes. Systemic blood pressure has only indirect effects unless markedly abnormal and affecting cerebral hemodynamics.
Category reason: This is a foundational question about regulation of cerebrospinal fluid dynamics and intracranial pressure, which is a core Physiology concept rather than a nursing intervention/prioritization scenario.

Question 48

What is the first sense lost during anesthesia?

Accepted Answer

Answer reason: During induction of general anesthesia, higher cortical functions and complex sensory integration are depressed early. Gustation (taste) is considered to diminish early as anesthesia progresses, while hearing is typically among the last senses to be lost and one of the first to return. Smell and vision are not generally taught as the earliest lost compared with taste in standard nursing/anesthesia physiology MCQs. Therefore, the best answer is taste.
Category reason: This question tests the physiologic sequence of sensory depression during anesthesia rather than a nursing intervention or safety decision, so it fits Physiology within NursingScience.

Question 49

In the human body, fats are stored in the?

Accepted Answer

Answer reason: The primary storage site for body fat (triglycerides) is adipose tissue, where adipocytes store energy for later use. Adipose also serves endocrine functions (e.g., leptin secretion) and provides insulation and cushioning. While small amounts of lipids can accumulate in organs like the liver or be present in muscle, these are not the main physiologic storage depot; excess storage there can be pathologic (e.g., fatty liver).
Category reason: This question tests where the body stores fat as part of normal body function and energy regulation, which is a foundational physiology concept rather than a nursing intervention or safety decision.

Question 50

Site of RBC formation in 20 years old healthy male is mainly?

Accepted Answer

Answer reason: In a healthy 20-year-old, erythropoiesis occurs primarily in red bone marrow. In adults, red marrow is predominantly found in flat bones of the axial skeleton (e.g., vertebrae, ribs, sternum, pelvis) and proximal ends of some long bones, but the main site is the flat bones. The liver and yolk sac are important sites of RBC production during fetal development, not adulthood. Therefore, flat bones is the best answer.
Category reason: This question tests the normal site of erythropoiesis across the lifespan, which is a foundational body-function concept within Physiology rather than a nursing care decision.

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