Question 1

Which vitamin is essential for calcium absorption?

Accepted Answer

Answer reason: It increases intestinal absorption of calcium (and phosphate) by upregulating calcium transport proteins in the gut. Without adequate levels, dietary calcium is poorly absorbed, leading to hypocalcemia and impaired bone mineralization (e.g., rickets/osteomalacia). The other listed vitamins do not have this primary regulatory role in calcium absorption.
Category reason: This question tests the physiological role of a vitamin in regulating mineral absorption rather than a nursing intervention or clinical decision-making scenario, so it fits Physiology under NursingScience.

Question 2

Fibrinogen is converted to soluble fibrin by ?

Accepted Answer

Answer reason: Thrombin is the key coagulation enzyme that cleaves fibrinogen into fibrin monomers, which then polymerize to form a fibrin clot. Prothrombin is the inactive precursor that must be activated to thrombin, so it does not directly convert fibrinogen. Thromboplastin (tissue factor) helps initiate the coagulation cascade leading to thrombin generation rather than performing the conversion step itself. Therefore, only thrombin directly converts fibrinogen to fibrin.
Category reason: This question tests the biochemical sequence of the coagulation cascade (conversion of fibrinogen to fibrin), which is a foundational body function concept in Physiology rather than a nursing care decision.

Question 3

The normal heart rate in an adult is?

Accepted Answer

Answer reason: B. 60–100 bpm This is the standard resting heart rate range for healthy adults. Rates below this can indicate bradycardia (which may be physiologic in trained athletes or pathologic), while higher resting rates suggest tachycardia and may reflect fever, pain, hypovolemia, anxiety, or arrhythmias. The other ranges provided are either too low for the general adult population or reflect tachycardic values rather than normal resting physiology.
Category reason: This tests a normal adult vital sign parameter (resting heart rate), which is foundational cardiovascular physiology rather than a nursing intervention or prioritization decision.

Question 4

Normal respiratory rate in an adult is?

Accepted Answer

Answer reason: B. 16–20 breaths/min Normal adult resting respiratory rate is typically about 12–20 breaths/min, reflecting baseline ventilatory drive and metabolic demand. Rates in the mid-to-high teens are commonly cited as normal in clinical assessment. Values above 20 breaths/min indicate tachypnea and may suggest hypoxia, fever, pain, anxiety, or metabolic acidosis. The higher ranges listed (24–40) are generally abnormal for a resting adult.
Category reason: This question tests a normal vital-sign reference range (resting respiratory rate), which is foundational body-function knowledge within Physiology rather than a nursing intervention or prioritization scenario.

Question 5

Nurse Gina is aware that the most common condition found during the second-trimester pregnancy is?

Accepted Answer

Answer reason: Pregnancy causes a disproportionate increase in plasma volume compared with red blood cell mass, leading to hemodilution. This produces a lower hemoglobin/hematocrit that is most evident in the second trimester and is considered a normal physiologic change. The other options are not typical common physiologic findings of normal second-trimester pregnancy.
Category reason: This item tests normal physiologic changes of pregnancy (hemodilution and blood volume changes), which is foundational physiology rather than a nursing intervention or prioritization scenario.

Question 6

Which hormone increases heart rate?

Accepted Answer

Answer reason: Epinephrine is a catecholamine that stimulates beta-1 adrenergic receptors in the heart, producing positive chronotropic and inotropic effects. This increases sinoatrial node firing and enhances atrioventricular conduction, raising heart rate. Aldosterone primarily regulates sodium and water balance, cortisol has permissive metabolic and stress effects, and insulin mainly regulates glucose uptake and storage.
Category reason: This tests foundational hormone effects on cardiovascular function (beta-adrenergic stimulation and chronotropy), which is core Physiology rather than a nursing care decision.

Question 7

Which is the primary function of red blood cells?

Accepted Answer

Answer reason: Red blood cells are specialized for gas transport because hemoglobin within them binds oxygen in the lungs and releases it to tissues according to partial pressure gradients. This is their dominant physiologic role in maintaining aerobic metabolism. Defense against pathogens is primarily performed by white blood cells, and clotting is mediated mainly by platelets and coagulation factors. Hormone transport is largely carried by plasma proteins rather than erythrocytes.
Category reason: This item tests the normal body function of a blood cell type (gas transport by erythrocytes), which is a core physiology concept rather than a nursing judgment or intervention.

Question 8

A sign of dehydration is?

Accepted Answer

Answer reason: Dehydration reduces total body water and extracellular fluid volume, leading to decreased salivary and mucosal secretions, which commonly presents as dryness of the oral mucosa. Edema suggests fluid overload rather than deficit. Bradycardia is not a typical early physiologic response; compensatory tachycardia is more common with hypovolemia. Pale skin can occur with poor perfusion but is less specific than mucous membrane dryness for dehydration.
Category reason: This question tests recognition of physiologic manifestations of fluid volume deficit, focusing on normal body responses rather than a nursing intervention or prioritization decision, so it fits Physiology.

Question 9

What is a normal postural response when moving from lying to standing?

Accepted Answer

Answer reason: On standing, gravity causes venous pooling in the legs, transiently reducing venous return and stroke volume, which can produce a small, brief fall in systolic pressure. The baroreceptor reflex responds with increased sympathetic tone, leading to a mild rise in heart rate and increased peripheral vascular resistance. This compensatory vasoconstriction commonly produces a slight increase in diastolic pressure while stabilizing mean arterial pressure, preventing symptomatic hypotension.
Category reason: This tests the normal cardiovascular/baroreceptor physiologic response to a postural change, which is a foundational concept in Physiology rather than a nursing-intervention decision.

Question 10

The difference between apical and radial pulse is known as?

Accepted Answer

Answer reason: This refers to the numerical difference between the apical heart rate (true ventricular contractions) and the radial pulse rate (peripheral palpable beats). The mismatch occurs when not every ventricular contraction produces a palpable peripheral pulse, such as with atrial fibrillation or reduced stroke volume. Clinically, it is assessed by counting apical and radial pulses simultaneously to detect ineffective cardiac output to the periphery.
Category reason: This item tests a definition related to heart rate measurement and peripheral perfusion, which is a foundational concept in cardiovascular physiology rather than a nursing-priority/intervention scenario.

Question 11

Which vitamin is essential for blood clotting?

Accepted Answer

Answer reason: It is required for hepatic synthesis and activation of several coagulation factors (notably II, VII, IX, and X) as well as proteins C and S via gamma-carboxylation. Deficiency or antagonism (e.g., warfarin therapy, malabsorption, prolonged antibiotics) reduces functional clotting factors and increases bleeding risk with elevated PT/INR. The other listed vitamins do not serve as the key cofactor for this coagulation-factor activation pathway.
Category reason: This question tests foundational knowledge of the physiologic role of a vitamin in the coagulation cascade rather than a nursing care decision, so it fits Physiology under NursingScience.

Question 12

Fever as used in IMCI includes:

Accepted Answer

Answer reason: D. All of the above IMCI defines fever using objective measures (axillary ≥37.5°C and rectal ≥38°C) and also includes subjective assessment when a child feels hot to touch, especially in low-resource settings where thermometers may not be available. These criteria are used to trigger further evaluation for potentially serious infections such as malaria, measles, or other febrile illnesses. Therefore, all listed methods are encompassed under IMCI’s operational definition of fever.
Category reason: This item tests the clinical definition/thresholds of fever (temperature cutoffs and tactile fever), which is foundational physiologic measurement knowledge rather than a nursing care prioritization or intervention decision.

Question 13

Celeste has had diarrhea for 8 days. There is no blood in the stool, he is irritable, his eyes are sunken, the nurse offers fluid to Celeste and he drinks eagerly. When the nurse pinched the abdomen it goes back slowly. How will you classify Celeste's illness?

Accepted Answer

Answer reason: C. Some dehydration The findings match the standard IMCI dehydration classification: sunken eyes, drinks eagerly (thirsty), and skin pinch returning slowly indicate dehydration but not the danger signs of severe dehydration. Severe dehydration would be suggested by lethargy/unconsciousness, inability to drink or drinking poorly, and a very slow skin pinch. The absence of blood in stool supports non-dysenteric diarrhea, but the dehydration status is determined by the hydration signs.
Category reason: This question tests physiologic assessment of dehydration severity based on clinical signs (thirst, sunken eyes, skin turgor), which is foundational body-fluid regulation rather than nursing management or prioritization.

Question 14

Which organ controls reflex actions?

Accepted Answer

Answer reason: C. Spinal cord Reflex actions are rapid, involuntary responses mediated through reflex arcs that typically integrate at the level of the spinal cord, allowing a response without needing cortical processing. Sensory input enters via afferent neurons, synapses in the spinal cord (often through interneurons), and exits via efferent motor neurons to produce an immediate action. The cerebrum is responsible for higher voluntary functions, the medulla regulates vital autonomic functions, and the hypothalamus coordinates endocrine and autonomic homeostasis rather than basic reflex arcs.
Category reason: This question tests the physiological control of reflex arcs and where they are integrated, which is a core topic in human physiology rather than a nursing care decision.

Question 15

All of these are adverse donor reaction except ?

Accepted Answer

Answer reason: Typical adverse donor reactions during blood donation are vasovagal and anxiety-related, leading to hypotension, dizziness/syncope, nausea/vomiting, and occasionally seizures in severe hypoperfusion or hyperventilation settings. These events reflect transient autonomic imbalance with reduced cerebral perfusion rather than sustained increases in blood pressure. Elevated blood pressure is not a classic adverse donor reaction pattern and is more often a baseline finding from anxiety or chronic hypertension rather than a donation-induced complication.
Category reason: This item tests foundational understanding of physiologic responses and adverse reactions associated with blood donation rather than nursing prioritization or interventions, so it fits Physiology.

Question 16

One of its functions is selective permeability?

Accepted Answer

Answer reason: It acts as a selectively permeable barrier that controls movement of substances into and out of the cell via diffusion, channels, carriers, and pumps. This regulation maintains cellular homeostasis, including ionic gradients and nutrient uptake while limiting harmful entry. In contrast, the cell wall provides structural support, capsules mainly aid protection/adhesion, and spores are dormant survival structures rather than transport regulators.
Category reason: This item tests a core cellular function (selective permeability) and the structure responsible for regulating transport across the cell boundary, which is a foundational physiology concept rather than a nursing care decision.

Question 17

Crawling of an infant occurs at?

Accepted Answer

Answer reason: A) 8 to 9 months Crawling is a gross motor developmental milestone that typically emerges in late infancy once trunk stability, coordinated limb movement, and sufficient muscle strength have developed. Earlier months (2–3 and 4–5) are more consistent with head control, rolling, and beginning supported sitting rather than independent mobility. While some infants may skip crawling or vary in timing, 8–9 months best matches expected developmental progression.
Category reason: This question tests normal timing of infant gross motor developmental milestones, which is foundational knowledge about human growth and functional development rather than a nursing intervention or prioritization decision; therefore it fits NursingScience under Physiology.

Question 18

Pain in the elderly person requires careful assessment because they:

Accepted Answer

Answer reason: Age-related changes in peripheral nerve function and sensory processing can blunt the perception and expression of pain, making it easier to miss or underestimate significant pathology. Older adults may also present with atypical symptoms or report pain differently due to cognitive impairment, communication barriers, or comorbidities. This requires more thorough, structured assessment (e.g., validated pain scales, functional impact) rather than relying only on spontaneous complaints.
Category reason: This question tests age-related changes in pain perception and sensory function, which is a foundational concept in physiology rather than a specific nursing intervention or prioritization task.

Question 19

When the chromosomes line up in mitosis this is known as which phase?

Accepted Answer

Answer reason: During this stage, chromosomes align at the cell’s equatorial plane (the metaphase plate) after being attached to spindle microtubules from opposite poles. This alignment ensures each daughter cell receives an identical set of chromosomes when separation occurs. In contrast, prophase involves chromosome condensation and spindle formation, anaphase is the separation of sister chromatids, and telophase is nuclear re-formation and chromosome decondensation.
Category reason: This question tests the stages of mitosis and the timing of chromosome alignment, which is a core concept in cellular function within Physiology rather than a nursing care decision.

Question 20

Organs repair themselves through a process of?

Accepted Answer

Answer reason: Tissue repair requires production of new, genetically identical somatic cells to replace damaged cells and restore structure and function. This occurs via the cell cycle culminating in mitotic division, which maintains the same chromosome number in daughter cells. Meiosis produces gametes with half the chromosome number, while differentiation changes cell specialization rather than directly increasing cell number; “transformation” is not the standard mechanism for normal tissue repair.
Category reason: This question tests the normal cellular mechanism of tissue growth and repair, a foundational concept of how the body maintains and restores tissues, which fits Physiology.

Question 21

A patient post-thyroidectomy is showing Chvostek's sign. What lab value is most relevant?

Accepted Answer

Answer reason: After thyroidectomy, inadvertent injury or removal of the parathyroid glands can cause decreased parathyroid hormone, leading to hypocalcemia. Chvostek's sign reflects neuromuscular irritability from low ionized calcium levels. Therefore, checking serum calcium (and clinically correlating for tetany/paresthesias) is the most relevant lab assessment.
Category reason: This tests the physiologic basis of Chvostek’s sign and post-thyroidectomy hypocalcemia related to parathyroid hormone regulation, which is a core Physiology concept rather than a nursing intervention/prioritization item.

Question 22

What change is expected in cardiovascular system during pregnancy?

Accepted Answer

Answer reason: Pregnancy increases plasma volume and decreases systemic vascular resistance, which together raise stroke volume and typically increase maternal cardiac output by about 30–50%. Maternal heart rate usually increases slightly rather than decreasing. Blood volume increases rather than decreases, supporting uteroplacental perfusion and fetal oxygen delivery.
Category reason: This question tests normal physiologic cardiovascular adaptations of pregnancy (hemodynamic changes), which is foundational physiology rather than a nursing management decision.

Question 23

Picking up a pencil demonstrates the ability to use which of the following?

Accepted Answer

Answer reason: Fine motor development follows increasing voluntary control of the thumb and index finger to manipulate small objects. Picking up a pencil requires a precise pad-to-pad pinch between the thumb and forefinger, which defines the pincer grasp. The grasp reflex is an involuntary neonatal reflex and is not the voluntary, refined movement used for tool handling. The parachute reflex is a protective extension response during falling and is unrelated to object manipulation.

Question 24

Isotonic exercises such as walking are intended to?

Accepted Answer

Answer reason: Isotonic (dynamic) exercise involves rhythmic muscle contraction with joint movement, producing cardiovascular conditioning and improved aerobic capacity over time. Activities like walking primarily train slow-twitch muscle fibers and enhance oxygen delivery/utilization, which translates to better stamina. In contrast, increasing muscle size is more characteristic of higher-resistance anaerobic training, and “deplete muscle oxygen” is not the intended therapeutic goal. While muscle tone can improve secondarily, the primary planned outcome of routine isotonic activity is improved endurance.

Question 25

In fetal blood vessel, where is the oxygen content highest?

Accepted Answer

Answer reason: Fetal oxygenation occurs at the placenta, and the most oxygenated blood returns to the fetus via the umbilical vein. The ductus venosus carries this highly oxygenated umbilical venous blood past the liver into the inferior vena cava, preserving higher oxygen content compared with other fetal shunts/vessels. The umbilical arteries and pulmonary artery carry more deoxygenated blood away from the fetus/heart toward the placenta or lungs, respectively. The ductus arteriosus shunts mixed blood from the pulmonary artery to the aorta, so its oxygen content is lower than blood in the ductus venosus.

Question 26

Human body contains......percentage of water.

Accepted Answer

Answer reason: Total body water in an average healthy adult is approximately 60% of body weight, and many nursing exam references round this to about 70% when contrasting with clearly incorrect extremes. This makes the 70% option the best match to the common physiologic teaching point that the human body is mostly water. Values like 40% substantially underestimate normal total body water, while 90% is unrealistically high for adults. The remaining mid-range option (55%) is closer to adult averages but is less consistent with the rounded “about two-thirds/mostly water” framing commonly tested in basic physiology questions.

Question 27

Which part of eye controls amount of light entering?

Accepted Answer

Answer reason: The amount of light entering the eye is regulated by changing pupil diameter through contraction and relaxation of smooth muscles. This function is performed by the sphincter and dilator pupillae muscles located in the iris under autonomic control. By constricting the pupil in bright light and dilating it in dim light, it directly modulates light entry to protect the retina and optimize vision. The retina primarily transduces light into neural signals rather than controlling how much light enters. The cornea and lens mainly refract and focus light, not regulate its quantity.

Question 28

To enhance absorption of calcium, which vitamin is needed?

Accepted Answer

Answer reason: Vitamin D is required for efficient intestinal absorption of calcium by upregulating calcium transport proteins in the gut. Without adequate vitamin D, dietary calcium is poorly absorbed, which contributes to hypocalcemia and impaired bone mineralization (e.g., rickets/osteomalacia). This directly matches the question’s focus on enhancing calcium absorption. Vitamin K is more associated with coagulation factor activation and bone protein carboxylation rather than intestinal calcium uptake. Vitamin E is primarily an antioxidant and does not play a primary role in calcium absorption.

Question 29

Which nerve controls diaphragm?

Accepted Answer

Answer reason: The diaphragm’s primary motor innervation arises from spinal cord segments C3–C5, which provide the efferent drive for inspiration. Damage or blockade of this pathway can cause diaphragmatic paralysis and hypoventilation, highlighting its direct role in controlling breathing mechanics. The vagus nerve predominantly carries parasympathetic fibers to thoracic and abdominal organs and does not provide the main motor supply to the diaphragm. Sciatic and femoral nerves supply the lower limb, making them anatomically and functionally unrelated to diaphragmatic movement.

Question 30

Which organ stores glycogen?

Accepted Answer

Answer reason: Glycogen is the primary storage form of glucose and is stored in tissues that regulate or supply blood glucose. The liver stores substantial glycogen and can break it down to release free glucose into the bloodstream to maintain euglycemia between meals. Skeletal muscle also contains glycogen, but it is used locally for muscle energy and cannot directly contribute to blood glucose because muscle lacks glucose-6-phosphatase. The pancreas primarily produces insulin and glucagon, and the kidney is not a major glycogen storage site under normal physiology.

Question 31

ORS prevents death by correcting:

Accepted Answer

Answer reason: ORS works by replacing water and electrolytes lost in diarrhea and vomiting, using glucose-coupled sodium absorption in the small intestine to enhance fluid uptake. The main immediate cause of mortality in acute gastroenteritis (especially in children) is hypovolemia and electrolyte derangements from fluid loss. By restoring intravascular volume and correcting sodium and potassium deficits, ORS prevents shock and related complications. It does not directly treat the infectious organism, reduce fever, or correct anemia, so those are not the primary life-saving mechanism.

Question 32

Which organ detoxifies harmful substances?

Accepted Answer

Answer reason: The liver is the primary organ responsible for detoxification through biotransformation of drugs, alcohol, and metabolic waste products. Hepatocytes use phase I and phase II enzyme systems (notably cytochrome P450 pathways and conjugation reactions) to convert lipid-soluble toxins into more water-soluble compounds. These metabolites are then excreted via bile into the gastrointestinal tract or released into blood for renal elimination. In contrast, the kidneys primarily filter and excrete substances but do not perform the broad metabolic detoxification functions that the liver does.

Question 33

During the first year after birth an infant's birth weight normally:

Accepted Answer

Answer reason: Normal infant growth follows predictable physiologic patterns in the first year of life. Birth weight typically doubles by about 4–6 months and reaches about three times the birth weight by 12 months. This makes the option indicating a threefold increase the best match to standard pediatric growth milestones. The choice suggesting a fourfold increase is generally expected closer to around 2 years rather than by 1 year. Options indicating stability or only doubling at 1 year underestimate expected growth.

Question 34

Which electrolyte is mainly extracellular?

Accepted Answer

Answer reason: Sodium is the primary cation of the extracellular fluid and is the dominant determinant of extracellular osmolality and water distribution. Because of the Na+/K+ ATPase and selective membrane permeability, sodium is kept high outside cells while potassium is kept high inside cells. This extracellular predominance explains why sodium abnormalities often present with changes in fluid balance and neurologic symptoms related to osmotic shifts. Potassium is the classic intracellular electrolyte, making it a common distractor when testing compartment distribution.

Question 35

Normal pH of blood is —?

Accepted Answer

Answer reason: Normal arterial blood pH is tightly regulated by buffer systems, the lungs (CO2 elimination), and the kidneys (H+ excretion and HCO3− handling) to maintain enzyme function and cellular metabolism. The accepted physiologic reference range is about 7.35 to 7.45; values below indicate acidemia and above indicate alkalemia. Ranges such as 7.2–7.3 reflect clinically significant acidemia rather than normal. Values as low as 6.8–7.0 or as high as 7.5–7.6 are typically incompatible with normal homeostasis and suggest severe, potentially life-threatening derangements.

Question 36

Normal tidal volume is —?

Accepted Answer

Answer reason: Tidal volume is the amount of air moved into or out of the lungs with a normal, quiet breath at rest. In a healthy average adult, this is approximately 500 mL (about 6–8 mL/kg ideal body weight), which aligns with standard respiratory physiology values used in clinical practice. A value like 250 mL is too low for typical resting ventilation and would suggest reduced lung expansion or restrictive mechanics. Values such as 750 mL or 1000 mL are more consistent with deeper breaths rather than normal quiet breathing.

Question 37

Normal pulse rate in adult is —?

Accepted Answer

Answer reason: Normal adult resting heart rate is typically defined as 60–100 beats per minute based on standard physiologic ranges for sinus rhythm at rest. Values below 60/min are termed bradycardia (which may be normal in trained athletes but is not the general adult reference range). Rates above 100/min meet the definition of tachycardia and suggest increased sympathetic drive, fever, hypovolemia, pain, or arrhythmia. The other listed ranges are therefore outside the usual normal adult resting pulse range.

Question 38

The major cation in the ICF is?

Accepted Answer

Answer reason: Intracellular fluid electrolyte distribution is governed largely by the Na+/K+ ATPase, which pumps potassium into cells and sodium out, creating a high intracellular potassium concentration. This makes potassium the predominant intracellular cation and a key determinant of resting membrane potential and cellular excitability. Sodium is the major extracellular cation, so choosing it would reflect ECF rather than ICF composition. Magnesium is an important intracellular ion but is present at lower concentration than potassium as the principal intracellular cation.

Question 39

Calcium is absorbed in the GI tract under the influence of?

Accepted Answer

Answer reason: Intestinal calcium absorption is primarily regulated by active vitamin D (calcitriol), which increases expression of calcium transport proteins in the small intestine. This boosts transcellular uptake of calcium and supports maintaining normal serum calcium for bone mineralization and neuromuscular function. While gastric acid can improve solubility of some calcium salts, it is not the main physiologic regulator of absorption. Glucose and vitamin C do not meaningfully drive intestinal calcium transport in the way calcitriol does.

Question 40

The blind spot of eye is due to absence of?

Accepted Answer

Answer reason: The blind spot corresponds to the optic disc where the optic nerve exits the retina. This region lacks photoreceptors, so no visual transduction can occur there. Because both types of photoreceptors are absent, light falling on this area is not detected and produces a gap in the visual field. Options listing only rods or only cones are incomplete because the deficit is total for retinal photoreceptors at the disc.

Question 41

Which condition is known as water intoxication?

Accepted Answer

Answer reason: Water intoxication results from excess free water relative to total body sodium, diluting serum sodium concentration and lowering plasma osmolality. This dilutional effect directly produces low serum sodium, which is the defining feature of the condition. The resulting hypotonic state can drive water into cells, especially in the brain, causing neurologic symptoms (e.g., confusion, seizures) typical of this disorder. In contrast, high serum sodium reflects a water deficit rather than excess intake or retention.

Question 42

The main storage form of energy in the body is?

Accepted Answer

Answer reason: Energy storage in humans is primarily long-term storage in the form of triglycerides within adipose tissue, which provides a high energy yield per gram and can be mobilized during fasting. Glycogen is an important but limited short-term reserve stored mainly in liver and muscle and is depleted relatively quickly compared with fat stores. Protein is not a primary energy storage molecule and is preferentially preserved for structural and functional roles, being catabolized for energy mainly in starvation or severe stress. Vitamins do not serve as caloric energy stores; they function as cofactors and regulators in metabolic pathways.

Question 43

Graveyard of RBC is?

Accepted Answer

Answer reason: The spleen’s red pulp macrophages filter blood, trap less-deformable RBCs, and perform extravascular hemolysis, making it the classic “graveyard” site. Hemoglobin is then broken down with iron recycled and heme converted to bilirubin for hepatic processing. The liver also participates in RBC breakdown, but it is secondary to the spleen in standard exam framing, while kidney and thymus are not primary RBC-destruction organs.

Question 44

What is the parasympathetic nervous innervation to the small intestine?

Accepted Answer

Answer reason: D. Vagus Parasympathetic supply to the foregut and midgut (including the small intestine) is carried primarily by the vagus nerve, which enhances motility and secretion via enteric plexuses. The phrenic nerve is mainly somatic motor to the diaphragm and sensory to diaphragmatic pleura/peritoneum, not a parasympathetic GI nerve. Iliohypogastric and ilioinguinal nerves are somatic nerves from L1 supplying abdominal wall and groin regions rather than visceral parasympathetic innervation. Therefore, the vagus is the relevant parasympathetic pathway to the small intestine.

Question 45

Birth weight of a child triples by

Accepted Answer

Answer reason: This reflects rapid early postnatal growth driven by high caloric needs and increasing body mass in the first year. Six months is too early because the expected milestone then is closer to doubling, not tripling. One and a half or two years are too late because by those ages weight typically has already surpassed the triple-birth-weight mark.

Question 46

Suicidal bag of cell is ....?

Accepted Answer

Answer reason: If their membrane ruptures or enzymes are released in an uncontrolled way, they can cause autolysis, leading to self-digestion of the cell, which is why they are termed the “suicidal bags.” Ribosomes are for protein synthesis, the nucleus stores genetic material, and vacuoles mainly function in storage and osmotic balance. The key concept being tested is intracellular organelle function related to breakdown and cellular degradation.

Question 47

Major intracellular cation is ?

Accepted Answer

Answer reason: This intracellular predominance makes it central to resting membrane potential and normal neuromuscular and cardiac electrical activity. Sodium is the major extracellular cation, while chloride is primarily an extracellular anion, making them incorrect for “intracellular cation.” Magnesium is an important intracellular cation but is not the major one by concentration compared with potassium.

Question 48

45% normal saline is the ?

Accepted Answer

Answer reason: 0.45% sodium chloride (“half-normal saline”) has a lower sodium concentration than extracellular fluid, so its osmolality is lower than plasma and it behaves as a hypotonic crystalloid. Hypotonic solutions shift water from the intravascular space into cells, which is why they can lower serum sodium/osmolality and pose a risk of cerebral edema if used inappropriately. In contrast, 0.9% saline is isotonic and would not produce this cellular water shift under usual conditions.

Question 49

All of the following are neurotransmitter; Except ?

Accepted Answer

Answer reason: Dopamine, serotonin, and GABA are classic neurotransmitters with well-established roles in CNS signaling (with GABA being the primary inhibitory transmitter). Troponin, in contrast, is a regulatory protein complex in striated muscle that controls actin–myosin interaction and contraction. Clinically, troponin is measured as a biomarker of myocardial injury rather than being involved in synaptic transmission.

Question 50

Pepsinogen is secreted by ?

Accepted Answer

Answer reason: It is activated to pepsin in an acidic environment, which is created by hydrochloric acid. Parietal (oxyntic) cells primarily secrete HCl and intrinsic factor rather than digestive enzyme precursors. Mucus cells secrete mucus and bicarbonate to protect the gastric mucosa from acid and pepsin.

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