📝 Step 6 — KMU Past Papers & Exam Learning
This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.
🎯 How to Study KMU Past Papers
- Read the question carefully.
- Think about the answer before looking.
- Read the explanation slowly.
- Understand the reasoning behind the correct answer.
- Revise difficult questions again.
MCQ 1
Question:
A patient in shock develops progressive metabolic acidosis despite adequate pulmonary ventilation. Which mechanism most directly explains this finding?
Options:
Excess bicarbonate secretion
Enhanced glycogen storage
Anaerobic lactate production
Reduced plasma protein synthesis
Increased renal ammonium loss
Correct Answer:
Anaerobic lactate production
Explanation:
Tissue hypoperfusion causes cellular hypoxia, forcing cells to shift to anaerobic metabolism with increased lactic acid production.
MCQ 2
Question:
Which hemodynamic change most effectively maintains cerebral perfusion during early compensated hemorrhagic shock?
Options:
Reduced myocardial contractility
Peripheral venous pooling
Selective arteriolar vasoconstriction
Decreased sympathetic discharge
Suppressed renin release
Correct Answer:
Selective arteriolar vasoconstriction
Explanation:
Peripheral vasoconstriction redistributes blood toward vital organs such as the brain and heart during early shock.
MCQ 3
Question:
A patient with septic shock initially presents with warm flushed skin. Which physiological mechanism best explains this feature?
Options:
Generalized arterial vasodilation
Marked reduction in preload
Severe myocardial fibrosis
Increased blood viscosity
Pulmonary venous obstruction
Correct Answer:
Generalized arterial vasodilation
Explanation:
Inflammatory mediators in septic shock produce widespread vasodilation leading to warm peripheral circulation early in the condition.
MCQ 4
Question:
The most important immediate effect of reduced venous return in hemorrhagic shock is:
Options:
Decreased stroke volume
Increased arterial compliance
Enhanced coronary perfusion
Elevated capillary pressure
Reduced sympathetic activity
Correct Answer:
Decreased stroke volume
Explanation:
Reduced venous return lowers ventricular filling, decreasing stroke volume through the Frank-Starling mechanism.
MCQ 5
Question:
Which organ is most sensitive to prolonged reduction in perfusion during irreversible shock?
Options:
Skeletal muscle
Subcutaneous tissue
Large intestine
Brain tissue
Adipose tissue
Correct Answer:
Brain tissue
Explanation:
Neurons are highly dependent on continuous oxygen supply and rapidly undergo irreversible injury during prolonged hypoxia.
MCQ 6
Question:
A patient with myocardial infarction develops severe hypotension and pulmonary edema. Which compensatory response may further worsen cardiac workload?
Options:
Peripheral vasoconstriction
Reduced ADH secretion
Venous capacitance increase
Arteriolar relaxation
Decreased heart rate
Correct Answer:
Peripheral vasoconstriction
Explanation:
Excessive vasoconstriction increases afterload, making it more difficult for the failing heart to eject blood.
MCQ 7
Question:
Loss of sympathetic tone in neurogenic shock primarily causes hypotension through:
Options:
Reduced plasma oncotic pressure
Increased pulmonary resistance
Peripheral vascular dilation
Enhanced myocardial oxygen use
Decreased capillary permeability
Correct Answer:
Peripheral vascular dilation
Explanation:
Sympathetic loss causes widespread vasodilation and venous pooling, reducing venous return and arterial pressure.
MCQ 8
Question:
Which biochemical change contributes directly to cellular injury during severe shock?
Options:
ATP depletion
Excess glycogenesis
Reduced pyruvate formation
Enhanced lipid storage
Increased glycogen synthesis
Correct Answer:
ATP depletion
Explanation:
Reduced oxygen delivery impairs oxidative phosphorylation, decreasing ATP production and disrupting cellular homeostasis.
MCQ 9
Question:
A patient with anaphylactic shock develops rapid hypotension after exposure to an allergen. Which vascular change is most responsible?
Options:
Coronary vasospasm
Capillary thrombosis
Marked vasodilation
Arterial calcification
Venous fibrosis
Correct Answer:
Marked vasodilation
Explanation:
Histamine release during anaphylaxis causes widespread vasodilation and increased capillary permeability.
MCQ 10
Question:
The compensatory increase in heart rate during shock is primarily mediated by activation of:
Options:
Parasympathetic fibers
Baroreceptor reflexes
Chemoreceptor inhibition
Hypothalamic osmoreceptors
Pulmonary stretch receptors
Correct Answer:
Baroreceptor reflexes
Explanation:
Reduced arterial pressure decreases baroreceptor firing, stimulating sympathetic activation and tachycardia.
MCQ 11
Question:
Which microcirculatory alteration significantly worsens tissue perfusion during progressive shock?
Options:
Capillary leakage
Reduced plasma glucose
Enhanced lymphatic flow
Arteriolar calcification
Increased erythropoiesis
Correct Answer:
Capillary leakage
Explanation:
Increased capillary permeability allows plasma loss into tissues, reducing circulating volume and worsening hypoperfusion.
MCQ 12
Question:
A patient in shock has oliguria. Which physiological change most directly contributes to reduced urine output?
Options:
Increased renal perfusion
Reduced glomerular filtration
Enhanced tubular secretion
Elevated oncotic pressure
Reduced ADH activity
Correct Answer:
Reduced glomerular filtration
Explanation:
Decreased renal blood flow lowers glomerular filtration rate, causing oliguria during shock.
MCQ 13
Question:
The primary physiological purpose of vasoconstriction during shock is to:
Options:
Increase capillary filtration
Reduce myocardial contractility
Preserve perfusion of vital organs
Enhance venous compliance
Decrease systemic resistance
Correct Answer:
Preserve perfusion of vital organs
Explanation:
Vasoconstriction redistributes blood toward essential organs including the brain and heart.
MCQ 14
Question:
Which feature best differentiates neurogenic shock from hemorrhagic shock?
Options:
Hypotension
Reduced tissue perfusion
Peripheral vasodilation with bradycardia
Activation of RAAS
Decreased venous return
Correct Answer:
Peripheral vasodilation with bradycardia
Explanation:
Loss of sympathetic cardiac stimulation in neurogenic shock may produce bradycardia unlike hemorrhagic shock.
MCQ 15
Question:
A patient remains hypotensive despite restoration of blood volume after severe shock. Which stage is most likely present?
Options:
Compensated stage
Early progressive stage
Irreversible stage
Latent stage
Pre-shock stage
Correct Answer:
Irreversible stage
Explanation:
In irreversible shock, extensive cellular and organ damage prevents recovery despite correction of circulation.
MCQ 16
Question:
Which mediator contributes significantly to vasodilation in septic shock through nitric oxide production?
Options:
Cytokines
Histamine
Thromboxane
Insulin
Albumin
Correct Answer:
Cytokines
Explanation:
Inflammatory cytokines stimulate nitric oxide synthesis causing severe vasodilation in septic shock.
MCQ 17
Question:
The Frank-Starling mechanism becomes impaired in cardiogenic shock primarily due to:
Options:
Reduced ventricular pumping ability
Increased plasma osmolarity
Enhanced venous return
Elevated hemoglobin concentration
Reduced arterial elasticity
Correct Answer:
Reduced ventricular pumping ability
Explanation:
Myocardial damage impairs ventricular contractility despite adequate ventricular filling.
MCQ 18
Question:
Which treatment most directly increases oxygen-carrying capacity in hemorrhagic shock?
Options:
Crystalloid infusion
Vasopressor therapy
Blood transfusion
Bronchodilator therapy
Diuretic administration
Correct Answer:
Blood transfusion
Explanation:
Blood transfusion restores hemoglobin concentration and oxygen delivery capacity.
MCQ 19
Question:
Which cellular event contributes to membrane dysfunction during severe prolonged shock?
Options:
Failure of sodium-potassium pumps
Increased glycogen storage
Enhanced mitochondrial respiration
Reduced intracellular sodium
Excess protein synthesis
Correct Answer:
Failure of sodium-potassium pumps
Explanation:
ATP depletion impairs membrane ion pumps causing cellular swelling and dysfunction.
MCQ 20
Question:
A patient with septic shock develops disseminated intravascular coagulation. Which process most directly initiates this complication?
Options:
Excessive fibrinolysis
Inflammatory endothelial injury
Reduced platelet production
Chronic venous obstruction
Persistent hypoglycemia
Correct Answer:
Inflammatory endothelial injury
Explanation:
Inflammatory mediators damage vascular endothelium and activate coagulation pathways leading to DIC.
📌 Important Exam Strategy
KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.
✅ Revision Tip
If you can explain the reason behind the correct answer without looking at notes, your concept is strong.