Question 1

Which organism has white blood cell?

Accepted Answer

Answer reason: Lizard Vertebrates such as lizards have true blood with red blood cells and white blood cells (leukocytes) circulating in the bloodstream as part of the immune system. Insects (mosquito, house bug, cockroach) do not have “white blood cells” in the vertebrate sense; instead they have hemolymph with immune cells called hemocytes. Therefore, among the options, only the lizard has white blood cells.
Category reason: This question tests foundational knowledge about immune/blood cell types across animal groups (vertebrates vs insects), which is a physiology topic rather than a nursing care decision.

Question 2

Which sing suggests increased intracranial pressure?

Accepted Answer

Answer reason: Both A and B Increased intracranial pressure can trigger the Cushing reflex (Cushing triad), characterized by hypertension and bradycardia (often with irregular respirations) as a late sign of brainstem compression. Hypertension occurs as the body attempts to maintain cerebral perfusion pressure. Reflex bradycardia follows due to baroreceptor response to the rising blood pressure. Tachycardia is not part of the classic Cushing response for rising ICP.
Category reason: This question tests recognition of physiologic vital-sign changes caused by increased intracranial pressure (Cushing reflex), which is primarily a physiology concept rather than a nursing intervention/prioritization scenario.

Question 3

What organ helps you detox?

Accepted Answer

Answer reason: Liver The liver is the primary organ responsible for detoxification by metabolizing drugs, alcohol, and other toxins via hepatic enzymes (e.g., cytochrome P450) and converting them into more water-soluble compounds for excretion. It also processes ammonia into urea and conjugates bilirubin for elimination in bile. While kidneys excrete many waste products and drug metabolites, the liver is the main site of detoxification/biotransformation.
Category reason: This question tests foundational body function (detoxification/biotransformation) rather than nursing actions or prioritization, which fits Physiology.

Question 4

How much salt is present in the human body?

Accepted Answer

Answer reason: 250 grams Total body sodium content in an average adult is on the order of a few thousand millimoles, which corresponds to roughly 100 g of sodium. Converting sodium to sodium chloride (salt) gives an approximate body content around 250 g of NaCl. Much smaller (25 g) or much larger (1–3.5 kg) values are not physiologically consistent with typical extracellular fluid sodium stores.
Category reason: This question tests the approximate amount of salt (sodium chloride) contained in the human body, which is a body-composition/electrolyte concept within Physiology rather than a nursing intervention or safety judgment.

Question 5

What gives urine its yellow color?

Accepted Answer

Answer reason: Urobilin Urobilin (also called urochrome) is a pigment formed from bilirubin breakdown products and is excreted in urine, giving it the characteristic yellow color. Hemoglobin is normally not present in urine; if present (hematuria/hemoglobinuria), it can make urine appear red or cola-colored. Bile pigments more directly affect stool color, and bilirubin in urine typically darkens it rather than producing the normal yellow hue.
Category reason: This question tests the physiological basis of normal urine color and the pigment responsible for it, which is a foundational body-function concept rather than a nursing intervention decision.

Question 6

What is the primary function of hemoglobin?

Accepted Answer

Answer reason: Transporting oxygen Hemoglobin in red blood cells binds oxygen in the lungs and carries it to peripheral tissues, making oxygen transport its primary role. Its heme iron reversibly binds O2, allowing efficient loading and unloading based on tissue oxygen demand. Hemoglobin also contributes secondarily to CO2 transport and buffering blood pH, but these are not its primary function.
Category reason: This question tests the normal function of hemoglobin in blood gas transport, which is a core concept of human physiology rather than a nursing intervention or clinical decision-making scenario.

Question 7

Which of the following is a viviparous animal?

Accepted Answer

Answer reason: Cow Viviparous animals give birth to live young after internal development, which is characteristic of most mammals. A cow is a mammal and typically carries the fetus in the uterus and delivers a live calf. Hen, frog, and most fish are oviparous, laying eggs rather than giving birth to live young.
Category reason: This question tests a foundational concept of reproductive physiology (viviparous vs oviparous reproduction) rather than nursing care or clinical decision-making.

Question 8

Which organ controls body temperature, thirst, hunger, and sleep cycles?

Accepted Answer

Answer reason: Hypothalamus The hypothalamus is the primary homeostatic control center that regulates body temperature, thirst, appetite/hunger, and circadian (sleep–wake) rhythms. It integrates signals from the body and autonomic nervous system and coordinates endocrine responses via control of the pituitary. The pituitary secretes hormones but is regulated by the hypothalamus, while the cerebrum and brainstem are not the main centers for these specific homeostatic drives.
Category reason: This question tests core homeostatic regulation of temperature, thirst, hunger, and sleep–wake cycles, which is a physiologic function of the hypothalamus rather than a nursing intervention or prioritization scenario.

Question 9

True or False In shock, the first organ to show signs of dysfunction is the brain.?

Accepted Answer

Answer reason: True The brain is highly sensitive to decreases in cerebral perfusion and oxygen delivery, so early hypoperfusion often presents first as changes in mental status (restlessness, anxiety, confusion, decreased level of consciousness). These neurologic changes can occur before overt failure signs in other organs like the kidneys (oliguria) or liver. Therefore, early brain dysfunction is a key early indicator of shock.
Category reason: This item tests understanding of organ perfusion and early physiologic responses to shock, which is core Physiology rather than a nursing intervention or care-management decision.

Question 10

The client is admitted with COPD. Results are pH–7.36, CO2–45, O2–84, HCO3–28. This is?

Accepted Answer

Answer reason: Compensated respiratory acidosis. In COPD, chronic hypoventilation leads to CO2 retention (respiratory acidosis), and the kidneys compensate by retaining bicarbonate. Here pH is low-normal (7.36) with an elevated HCO3 (28), consistent with metabolic compensation, and the clinical context supports chronic respiratory acidosis. The low O2 (84) is also consistent with impaired gas exchange in COPD.
Category reason: This question tests interpretation of acid–base status (pH/PaCO2/HCO3) and compensation mechanisms, which is foundational physiology rather than a nursing intervention/prioritization scenario.

Question 11

Which electrolyte imbalance causes muscle cramps?

Accepted Answer

Answer reason: Hypocalcemia Low calcium increases neuromuscular excitability, leading to muscle cramps, tetany, and paresthesias. Hypocalcemia can also cause Chvostek and Trousseau signs and may prolong the QT interval. Hyperkalemia is more associated with muscle weakness and dangerous cardiac dysrhythmias, while hyponatremia primarily causes neurologic symptoms (e.g., confusion, seizures) rather than cramps as the hallmark finding.
Category reason: This item tests the physiologic effects of specific electrolyte abnormalities on neuromuscular function rather than a nursing intervention or prioritization decision, so it fits Physiology under NursingScience.

Question 12

Which electrolyte is most abundant in extracellular fluid?

Accepted Answer

Answer reason: Sodium Sodium is the primary cation in extracellular fluid and has the highest concentration there compared with other electrolytes listed. Potassium is the main intracellular cation, not extracellular. Magnesium and calcium are present in ECF but at much lower concentrations than sodium; calcium is also tightly regulated with much of it bound to proteins or stored in bone.
Category reason: This question tests foundational body-fluid electrolyte distribution (ECF vs ICF), which is a core concept in physiology rather than a nursing intervention or safety decision.

Question 13

When assessing a patient’s total body water percentage, the nurse is aware that all of the following factors influence this except?

Accepted Answer

Answer reason: gender Total body water (TBW) percentage is primarily determined by body composition: lean muscle contains more water than adipose tissue, so muscle mass and fat tissue strongly affect TBW. TBW also generally decreases with age due to reduced lean body mass. While average TBW differs between sexes largely because of differences in body fat percentage, it is the underlying body composition (fat vs. lean mass) that directly influences TBW, making “gender” the best “except” choice here.
Category reason: This item tests foundational principles about determinants of total body water and body composition rather than a nursing action or priority, which aligns best with Physiology.

Question 14

The function of the centrosome is?

Accepted Answer

Answer reason: Formation of spindle fibres The centrosome is the major microtubule-organizing center (MTOC) of animal cells and forms the mitotic spindle during cell division. It organizes microtubules that separate chromosomes in mitosis and meiosis. Osmoregulation is primarily a function of cell membranes and organelles like contractile vacuoles in some organisms, secretion is associated with the Golgi apparatus, and protein formation occurs at ribosomes/rough ER.
Category reason: This is a foundational cell biology question about an organelle’s role in cell division (microtubule organization/spindle formation), which fits under Physiology rather than nursing care decision-making.

Question 15

What is the normal pH of human blood?

Accepted Answer

Answer reason: 7.4 Normal arterial blood pH is tightly regulated around 7.35–7.45, reflecting a slightly alkaline environment necessary for normal enzyme function and cellular metabolism. A value of 7.4 is the commonly cited midpoint of this normal range. Values like 5 or 6 represent severe acidemia incompatible with life, while 8 indicates marked alkalemia.
Category reason: This question tests a normal physiologic parameter (acid–base balance and homeostatic regulation of blood pH), which is a core topic in Physiology rather than nursing action/decision-making.

Question 16

Which organ is known as the "graveyard of RBCs"?

Accepted Answer

Answer reason: Spleen The spleen is called the “graveyard of RBCs” because splenic macrophages in the red pulp filter and remove senescent or damaged erythrocytes from circulation. It also recycles hemoglobin components (iron is conserved and heme is converted to bilirubin). While the liver also participates in RBC breakdown (Kupffer cells), the classic primary site emphasized is the spleen.
Category reason: This question tests a foundational concept about where aged red blood cells are filtered and destroyed, which is part of normal blood/immune organ function and thus belongs to Physiology.

Question 17

What percentage of the human body is water?

Accepted Answer

Answer reason: 60% In an average healthy adult, total body water is approximately 60% of body weight, though it varies by age, sex, and body fat (higher in infants, lower in older adults and those with higher adiposity). This is a core physiology concept related to body fluid compartments (intracellular and extracellular fluid). Among the listed choices, 60% best matches the commonly taught adult reference value.
Category reason: This question tests a foundational body-fluid fact (total body water percentage), which is part of normal human function and fluid compartment concepts in Physiology rather than nursing care decision-making.

Question 18

Which vitamin helps in blood clotting?

Accepted Answer

Answer reason: Vitamin K Vitamin K is required for hepatic synthesis (gamma-carboxylation) of several clotting factors—particularly factors II (prothrombin), VII, IX, and X—as well as proteins C and S. Without adequate vitamin K, these factors cannot bind calcium effectively, impairing the coagulation cascade and increasing bleeding risk. This is why vitamin K deficiency or antagonism (e.g., warfarin) prolongs clotting times such as PT/INR.
Category reason: This is a foundational question about the physiologic role of a vitamin in the coagulation process, focusing on body function rather than nursing interventions or clinical prioritization, so it fits NursingScience under Physiology.

Question 19

The enzyme responsible for the digestion of carbohydrates is?

Accepted Answer

Answer reason: Amylase Amylase is the primary enzyme that digests carbohydrates by hydrolyzing starch into smaller sugars (e.g., maltose and dextrins). It is produced in the salivary glands (salivary amylase) and the pancreas (pancreatic amylase). In contrast, pepsin and trypsin digest proteins, while lipase digests fats.
Category reason: This question tests the function of digestive enzymes in breaking down macronutrients, which is a core concept of gastrointestinal physiology rather than nursing interventions or clinical decision-making.

Question 20

Normal respiratory rate is?

Accepted Answer

Answer reason: 12-20 breathes/min. Normal adult resting respiratory rate is typically 12–20 breaths per minute. A range of 10–15 is too low for many adults and may indicate bradypnea if persistent, while 15–30 extends into tachypnea and is not considered normal at rest. Therefore, 12–20 best represents the accepted normal range.
Category reason: This question tests the normal physiologic range for adult respiratory rate (a vital sign), which is a core concept in Physiology rather than a nursing intervention or prioritization scenario.

Question 21

What is the normal range of adult respiratory rate?

Accepted Answer

Answer reason: 12–20 breaths/min Normal adult resting respiratory rate is typically 12–20 breaths per minute. Rates below this range suggest bradypnea (e.g., CNS depression, opioid effect), while rates above suggest tachypnea (e.g., fever, hypoxia, pain, anxiety). The other options are either too low (10–12) or extend above normal adult resting values (16–24).
Category reason: This question tests the normal physiologic vital-sign range for adult respiration, which is a core Physiology concept rather than a nursing intervention or prioritization decision.

Question 22

Which protein in red blood cells carries oxygen throughout the body?

Accepted Answer

Answer reason: A) Hemoglobin Hemoglobin is the primary oxygen-carrying protein within red blood cells, binding oxygen in the lungs and releasing it in peripheral tissues. Albumin is a plasma protein mainly responsible for oncotic pressure and transport of various substances, not oxygen carriage in RBCs. Myoglobin stores oxygen in muscle cells, and fibrinogen is a clotting factor involved in coagulation rather than gas transport.
Category reason: This question tests the physiological function of a blood protein in oxygen transport, which is a core concept in Physiology rather than nursing interventions or clinical decision-making.

Question 23

Which vitamin can be synthesized by humans in sunlight?

Accepted Answer

Answer reason: vitamin d UVB radiation from sunlight converts 7-dehydrocholesterol in the skin into cholecalciferol (vitamin D3), which is then activated by the liver and kidneys to calcitriol. This is the primary vitamin humans can synthesize with sun exposure. Vitamins A, E, and K are obtained mainly through diet and are not synthesized in the skin via sunlight.
Category reason: This question tests how the body produces a vitamin in response to sunlight exposure, which is a normal body function and therefore best fits Physiology.

Question 24

Smallest unit of life is?

Accepted Answer

Answer reason: Cell Living organisms are composed of cells, which are the smallest structures capable of performing all vital life processes (metabolism, growth, response to stimuli, and reproduction). Tissues and organs are higher levels of organization formed by groups of specialized cells. Organ systems are collections of organs working together, making them larger organizational units than a single cell.
Category reason: This item tests the basic biological/physiologic hierarchy of organization in living organisms (cell → tissue → organ → organ system), which is foundational Physiology rather than nursing clinical judgment.

Question 25

Absorption and secretion of electrolytes & water Absorption of NaCl: Na moves into the intestinal cells by the following mechanisms

Accepted Answer

Answer reason: Na-glucose or Na-amino acid cotransport Sodium absorption in the small intestine is strongly driven by secondary active transport mechanisms that couple Na+ entry to nutrient uptake via apical cotransporters (e.g., SGLT1 for glucose and Na+-amino acid transporters). The inward Na+ gradient is maintained by the basolateral Na+/K+ ATPase, making this pathway highly effective for net NaCl and water absorption. This physiology explains why oral rehydration solutions containing glucose enhance fluid and electrolyte absorption. The other listed mechanisms can occur, but nutrient-coupled Na+ uptake is the classic, most emphasized mechanism for intestinal Na+ entry.
Category reason: This item tests mechanisms of intestinal sodium absorption (transport physiology), which is foundational body-function knowledge rather than a nursing intervention decision.

Question 26

What is the normal body temperature of a healthy adult (in °C)?

Accepted Answer

Answer reason: 37,0°C Normal core body temperature for a healthy adult is commonly taught as approximately 37°C, acknowledging normal variation by time of day, measurement site, and individual baseline. Values around 36.0–37.5°C can be normal, but 37.0°C is the standard reference point used in clinical education. A temperature of 38.0°C is generally considered febrile rather than normal.
Category reason: This question tests a standard reference value for human thermoregulation and normal physiologic ranges, which falls under Physiology rather than nursing intervention or prioritization.

Question 27

A nurse is caring for an infant who has intractable or uncontrolled vomiting. The most important likely complication is?

Accepted Answer

Answer reason: Alkalosis Loss of gastric contents from persistent vomiting removes hydrochloric acid (H+) and chloride from the body, producing a hypochloremic metabolic alkalosis. Ongoing fluid loss also causes volume depletion, which sustains alkalosis by increasing renal bicarbonate reabsorption. Infants are particularly vulnerable because their smaller fluid reserve makes electrolyte and acid–base disturbances develop rapidly.
Category reason: This question tests the physiologic acid–base consequence of vomiting (loss of gastric acid leading to metabolic alkalosis), which is foundational body-function knowledge rather than a nursing action/priority decision.

Question 28

The heart rate is controlled by which part of the brain?

Accepted Answer

Answer reason: M. Oblongata Autonomic control of heart rate is primarily regulated by cardiovascular centers in the brainstem, especially the medulla, which integrates baroreceptor and chemoreceptor input. It modulates sympathetic and parasympathetic (vagal) outflow to the SA and AV nodes to increase or decrease heart rate. The cerebellum coordinates movement, the cerebrum handles higher cognition/voluntary control, and the hypothalamus influences autonomic tone but is not the primary beat-to-beat controller.
Category reason: This item tests the physiologic control of an autonomic function (heart rate) by a specific brain region, which is core human physiology rather than a nursing intervention or prioritization scenario.

Question 29

Which organelle controls cell activities?

Accepted Answer

Answer reason: Nucleus It contains the cell’s DNA and regulates gene expression, which directs protein synthesis and thereby governs most cellular functions. It also coordinates cell growth, metabolism, and division through control of transcription and cell-cycle checkpoints. In contrast, mitochondria primarily produce ATP, the Golgi modifies/packages proteins, and lysosomes digest cellular waste.
Category reason: This item tests core cell function and regulation (control of cellular activities by genetic instruction), which is a foundational physiology concept rather than a nursing care decision.

Question 30

Normal temperature of blood:

Accepted Answer

Answer reason: 37°C Blood temperature closely tracks core body temperature, which is maintained around 37°C by hypothalamic thermoregulation. Values like 35°C reflect mild hypothermia, while 40°C indicates significant hyperthermia/fever rather than normal physiology. 25°C is far below survivable core temperature and would be incompatible with normal function.
Category reason: This tests a normal physiologic parameter (core/blood temperature) rather than a nursing intervention or clinical decision, so it fits Physiology.

Question 31

Which of the following is responsible for fruit ripening?

Accepted Answer

Answer reason: Ethylene Ethylene is a gaseous plant hormone that triggers climacteric fruit ripening by increasing respiration and activating genes involved in softening, color change, and aroma production. It promotes chlorophyll breakdown and increases synthesis of pigments (e.g., carotenoids/anthocyanins) and cell-wall–degrading enzymes, leading to softer texture. Gibberellins mainly promote stem elongation and growth, while ascorbic acid is vitamin C and not a primary ripening signal.
Category reason: This is a foundational biology question about hormonal regulation of a physiological process (fruit ripening) rather than nursing care or clinical decision-making, so it best fits NursingScience under Physiology.

Question 32

Number of daughter cells formed after meiosis:

Accepted Answer

Answer reason: Meiosis consists of two consecutive cell divisions (meiosis I and II), resulting in four genetically distinct haploid daughter cells from one diploid parent cell.
Category reason: The question tests fundamental cellular and reproductive physiology concepts.

Question 33

The nurse observes a "Moro reflex" in a newborn. What does this indicate?

Accepted Answer

Answer reason: The Moro reflex is a primitive neonatal reflex characterized by symmetric abduction and extension of the arms followed by adduction, typically triggered by sudden movement or noise. Its presence in a newborn reflects an intact central nervous system and is expected in early infancy. Concern arises when the reflex is absent, asymmetric, or persists beyond the normal age of integration (about 4–6 months), which can suggest neurologic or musculoskeletal pathology.
Category reason: This tests knowledge of normal primitive reflexes and expected neurologic functioning in newborns, which is foundational developmental physiology rather than a nursing management/intervention scenario.

Question 34

Which vitamin is produced when your skin is exposed to sunlight?

Accepted Answer

Answer reason: UVB radiation converts 7-dehydrocholesterol in the epidermis into cholecalciferol (vitamin D3), which is then hydroxylated in the liver and kidney to the active form (calcitriol). This hormone-like vitamin is essential for calcium and phosphate homeostasis and normal bone mineralization. Deficiency can lead to rickets in children and osteomalacia in adults, especially with limited sun exposure.
Category reason: This question tests a normal body process—cutaneous synthesis of a vitamin in response to sunlight—so it fits Physiology rather than a nursing care decision category.

Question 35

Q. First milk of mother is called?

Accepted Answer

Answer reason: It is the initial breast secretion produced in late pregnancy and the first few days postpartum. It is thick and yellowish and is rich in immunoglobulins (especially IgA), leukocytes, and growth factors that provide passive immunity and support gut maturation. Compared with mature milk, it is lower in volume and fat but higher in protective proteins, making it ideal for the newborn’s early needs.
Category reason: This question tests a foundational concept about lactation and the physiologic composition of the first maternal milk, which is part of human physiology rather than a nursing care decision.

Question 36

Skin colour is depending on _____?

Accepted Answer

Answer reason: Skin pigmentation is primarily determined by the amount and type of melanin produced by melanocytes and distributed to keratinocytes. Increased melanin (especially eumelanin) produces darker skin, while reduced production results in lighter skin. Hemoglobin and temperature can cause transient changes in skin appearance (e.g., flushing, pallor, cyanosis) but do not set baseline skin color. Hormones may modulate pigmentation indirectly in some states, but the main determinant is melanin.
Category reason: This question tests the physiological determinant of baseline skin pigmentation (melanin production and distribution), which is foundational body-function knowledge rather than a nursing intervention or clinical judgment scenario.

Question 37

What is the primary neurotransmitter involved in muscle contraction?

Accepted Answer

Answer reason: At the neuromuscular junction, motor neurons release this transmitter, which binds nicotinic receptors on the muscle end plate and generates an end-plate potential. This depolarization triggers an action potential that propagates along the sarcolemma and down T-tubules, leading to calcium release from the sarcoplasmic reticulum. The increased intracellular calcium enables actin-myosin cross-bridge cycling and produces contraction. The other listed neurotransmitters are primarily involved in CNS modulation rather than initiating skeletal muscle contraction.
Category reason: This item tests foundational body-function knowledge about neuromuscular junction signaling and excitation-contraction coupling, which is a core Physiology concept rather than a nursing care decision.

Question 38

Which of the following mechanisms is used for transportation of particles too large to cross cell membrane?

Accepted Answer

Answer reason: Transport of material too large to pass directly through the lipid bilayer occurs via vesicular (bulk) transport. Endocytosis includes pinocytosis for fluids/solutes and phagocytosis for large particles, both bringing material into the cell in membrane-bound vesicles. Exocytosis is the complementary vesicular process that moves large molecules out of the cell by vesicle fusion with the plasma membrane.
Category reason: This question tests cellular transport mechanisms (endocytosis and exocytosis), which are core concepts in cell physiology rather than nursing interventions or clinical judgment.

Question 39

Which electrolyte imbalance is most likely to cause cardiac arrhythmias?

Accepted Answer

Answer reason: Low serum potassium alters myocardial membrane excitability and repolarization, increasing the risk of ectopy and serious dysrhythmias (e.g., ventricular arrhythmias), especially in patients on digoxin or with underlying heart disease. Typical ECG changes include flattened T waves, ST depression, and prominent U waves, reflecting delayed repolarization. Compared with sodium or calcium changes listed, potassium disturbances most directly and commonly precipitate clinically significant arrhythmias.
Category reason: This question tests the physiologic role of electrolytes—particularly potassium—in cardiac electrical activity and rhythm generation, which is foundational biomedical knowledge rather than a nursing intervention scenario.

Question 40

Which is the powerhouse of the cell?

Accepted Answer

Answer reason: It is the primary site of aerobic cellular respiration and oxidative phosphorylation, generating most of the cell’s ATP. High-energy–demand tissues (e.g., muscle, neurons) contain many of these organelles because they require continuous ATP production. Ribosomes synthesize proteins, the nucleus houses genetic material and regulates gene expression, and lysosomes digest cellular waste.
Category reason: This question tests core cell function and energy production at the organelle level, which is foundational physiology rather than nursing clinical decision-making.

Question 41

Which chemical messengers transmit signals across neurons?

Accepted Answer

Answer reason: They are released from the presynaptic neuron into the synaptic cleft and bind receptors on the postsynaptic membrane to propagate neural signaling. Hormones primarily act through the endocrine system and generally travel via the bloodstream to distant targets rather than across synapses. Enzymes catalyze biochemical reactions and do not serve as primary inter-neuronal signaling molecules. Cytokines are immune signaling proteins with roles in inflammation and immune regulation, not typical synaptic transmission.
Category reason: This question tests the basic mechanism of synaptic signaling between neurons, which is a core concept in physiology rather than nursing care decision-making.

Question 42

Which organ is primarily responsible for detoxification in the human body?

Accepted Answer

Answer reason: It is the main site of biotransformation of endogenous wastes and xenobiotics via phase I (e.g., cytochrome P450 oxidation/reduction) and phase II conjugation reactions, making compounds more water-soluble for elimination. It also converts ammonia to urea, metabolizes alcohol and many drugs, and excretes metabolites into bile. While kidneys eliminate many substances, the liver is the primary organ that chemically detoxifies them.
Category reason: This question tests foundational organ function (detoxification and metabolic processing), which is a core concept in human body function rather than a nursing care decision, so it fits Physiology.

Question 43

Which part of the brain regulates body temperature, hunger, and thirst?

Accepted Answer

Answer reason: It contains key autonomic and endocrine regulatory centers that maintain homeostasis. It controls thermoregulation via heat-loss and heat-production mechanisms, coordinates feeding behavior through hunger/satiety centers, and regulates fluid balance by driving thirst and influencing ADH release through hypothalamic nuclei. The other listed regions primarily govern higher cognition (cerebrum), coordination (cerebellum), or basic cardiorespiratory reflexes (medulla).
Category reason: This question tests foundational brain function and homeostatic regulation (temperature, appetite, thirst), which is core Physiology rather than a nursing care decision.

Question 44

Which is a sign of fluid overload?

Accepted Answer

Answer reason: Excess extracellular fluid increases capillary hydrostatic pressure and/or reduces oncotic balance, pushing fluid into the interstitial space and causing swelling. This presents clinically as dependent or generalized swelling and may be accompanied by weight gain and crackles if pulmonary congestion develops. In contrast, dry mucous membranes and hypotension are more consistent with fluid volume deficit, and tachycardia is nonspecific and commonly seen with hypovolemia or stress responses.
Category reason: This question tests a foundational body-fluid regulation concept—recognizing clinical signs associated with increased fluid volume—so it best fits Physiology rather than a nursing judgment/intervention scenario.

Question 45

Which IV fluid is isotonic?

Accepted Answer

Answer reason: 0.9% sodium chloride (normal saline) has an osmolality close to plasma, so it does not cause significant net water movement into or out of cells. Therefore it primarily expands the extracellular/intravascular compartment without shifting fluid across cell membranes. In contrast, 0.45% NaCl is hypotonic, while D5W becomes physiologically hypotonic after dextrose is metabolized, and 10% dextrose is hypertonic.
Category reason: This tests knowledge of solution tonicity and osmolality relative to plasma, which is a core physiology concept rather than a nursing judgment or prioritization scenario.

Question 46

What is the normal respiratory rate for an adult?

Accepted Answer

Answer reason: b) 12-20/min This is the accepted normal resting respiratory rate range for healthy adults. Values below this can indicate bradypnea from causes such as CNS depression or medication effects, while higher rates suggest tachypnea from fever, pain, anxiety, hypoxemia, or metabolic acidosis. Normal ranges are used as a baseline to recognize early deterioration and to trend changes over time. The other options are outside typical adult resting norms and would usually prompt further assessment.
Category reason: This tests a normal vital-sign reference range (respiratory rate), which is a foundational concept about normal body function and belongs to Physiology.

Question 47

Nerve impulse conduction is faster in —?

Accepted Answer

Answer reason: Myelin acts as an electrical insulator that increases membrane resistance and decreases capacitance, allowing action potentials to propagate more rapidly. Conduction becomes saltatory, with depolarization jumping between nodes of Ranvier rather than traveling continuously along the entire axon. This greatly increases conduction velocity compared with unmyelinated fibers, while synapses introduce delay and dendrites are not specialized for rapid long-distance conduction.
Category reason: This question tests the physiological basis of nerve impulse conduction velocity (saltatory conduction and myelin effects), which is foundational neurophysiology rather than a nursing care decision.

Question 48

Brain-এ কোন অংশ respiration, cardiac activity control করে?

Accepted Answer

Answer reason: It contains the vital autonomic centers that regulate respiration and cardiovascular function, including cardiac rate and vasomotor tone. These centers integrate input from chemoreceptors and baroreceptors and adjust breathing and heart activity reflexively to maintain homeostasis. The pons helps modulate breathing rhythm, but the primary life-sustaining control centers are in the medulla.
Category reason: This tests foundational control of vital functions by brainstem structures, which is a core Physiology topic rather than a nursing intervention or clinical prioritization scenario.

Question 49

How is oxygen mainly transported by blood in man?

Accepted Answer

Answer reason: Most oxygen in blood is carried bound reversibly to hemoglobin inside red blood cells as oxyhemoglobin, which greatly increases the blood’s oxygen-carrying capacity. Only a small fraction of oxygen is transported physically dissolved in plasma, and this dissolved portion mainly determines the PaO2 measured on arterial blood gases. Adsorption to the RBC surface is not a meaningful physiological transport mechanism compared with hemoglobin binding.
Category reason: This is a foundational question about how gases are transported in the blood, which is a core concept in human physiology rather than a nursing action or clinical decision.

Question 50

Muscle hypertrophy mean : ________

Accepted Answer

Answer reason: Hypertrophy refers to enlargement of an organ or tissue due to an increase in the size of its existing cells, not an increase in cell number (which is hyperplasia). In skeletal muscle, resistance training stimulates increased protein synthesis and addition of contractile elements, causing muscle fibers to grow larger. This leads to increased muscle bulk and strength compared with baseline.
Category reason: This item tests the definition of a physiological adaptation of skeletal muscle (cell size increase), which is a foundational body-function concept rather than a nursing intervention or safety decision.

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