📝 Step 5 — 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 student compares autonomic pathways and notes that one division produces more widespread body responses during stress. Which structural feature best explains this response?
Options:
Ganglia located within target organs
Extensive divergence from preganglionic neurons
Direct innervation of skeletal muscle
Absence of postganglionic neurons
Exclusive supply through cranial nerves
Correct Answer:
Extensive divergence from preganglionic neurons
Explanation:
Sympathetic pathways show greater divergence at ganglia, allowing one preganglionic neuron to influence many postganglionic neurons and produce widespread effects.
MCQ 2
Question:
A visceral organ receives autonomic fibers through a pathway in which the ganglion lies inside the organ wall. Which functional pattern is most likely produced?
Options:
Generalized emergency activation
Localized organ-specific response
Widespread vascular constriction
Adrenal catecholamine release
Segmental somatic reflex activity
Correct Answer:
Localized organ-specific response
Explanation:
Parasympathetic ganglia lie near or within target organs, producing focused and organ-specific control.
MCQ 3
Question:
During a frightening event, a person develops palpitations, dilated pupils, and sweating. Which integrated pathway best explains these findings?
Options:
Vagal discharge to thoracic organs
Sacral outflow to pelvic viscera
Thoracolumbar outflow with adrenal medullary activation
Cranial parasympathetic outflow to glands
Somatic motor discharge to skeletal muscles
Correct Answer:
Thoracolumbar outflow with adrenal medullary activation
Explanation:
The alarm response activates sympathetic thoracolumbar pathways and adrenal medulla, producing cardiovascular, pupillary, and sweating responses.
MCQ 4
Question:
A drug blocks nicotinic receptors in autonomic ganglia. Which transmission step will be most directly affected?
Options:
Postganglionic fiber to smooth muscle
Preganglionic fiber to ganglionic neuron
Adrenal cortex to blood circulation
Sensory receptor to dorsal horn
Skeletal motor neuron to muscle fiber
Correct Answer:
Preganglionic fiber to ganglionic neuron
Explanation:
All autonomic preganglionic neurons release acetylcholine onto nicotinic receptors present on ganglionic neurons.
MCQ 5
Question:
A patient receiving an autonomic drug develops dry mouth, constipation, blurred near vision, and urinary retention. Which receptor action is most likely reduced?
Options:
Alpha-1 adrenergic action
Beta-1 adrenergic action
Nicotinic ganglionic action
Muscarinic cholinergic action
Beta-2 adrenergic action
Correct Answer:
Muscarinic cholinergic action
Explanation:
Muscarinic receptors mediate parasympathetic effects on glands, gut, eye accommodation, and bladder emptying.
MCQ 6
Question:
A person stands suddenly from lying position. Which autonomic response normally prevents a fall in arterial pressure?
Options:
Increased vagal activity to SA node
Decreased adrenal medullary secretion
Increased sympathetic vasoconstrictor discharge
Increased parasympathetic gut activity
Decreased cardiac beta-1 stimulation
Correct Answer:
Increased sympathetic vasoconstrictor discharge
Explanation:
Standing causes venous pooling; sympathetic vasoconstrictor tone maintains vascular resistance and arterial pressure.
MCQ 7
Question:
An organ receives autonomic supply that promotes storage during filling and emptying during micturition. Which pairing is most appropriate?
Options:
Sympathetic storage, parasympathetic emptying
Parasympathetic storage, sympathetic emptying
Somatic storage, vagal emptying
Adrenal storage, sacral emptying
Enteric storage, cranial emptying
Correct Answer:
Sympathetic storage, parasympathetic emptying
Explanation:
Sympathetic activity supports bladder filling and storage, while sacral parasympathetic activity contracts the detrusor for emptying.
MCQ 8
Question:
A sympathetic postganglionic fiber supplies a sweat gland. Which neurotransmitter-receptor pattern is most consistent with this pathway?
Options:
Norepinephrine acting on alpha receptors
Acetylcholine acting on muscarinic receptors
Epinephrine acting on beta receptors
Dopamine acting on vascular receptors
Acetylcholine acting on skeletal nicotinic receptors
Correct Answer:
Acetylcholine acting on muscarinic receptors
Explanation:
Sweat glands are a major sympathetic exception because many sympathetic fibers to sweat glands are cholinergic and act on muscarinic receptors.
MCQ 9
Question:
A student observes that vagal activity slows the resting heart rate below the intrinsic rhythm of the SA node. Which receptor mainly mediates this effect?
Options:
Beta-1 receptor
Alpha-1 receptor
Muscarinic M2 receptor
Nicotinic Nn receptor
Beta-2 receptor
Correct Answer:
Muscarinic M2 receptor
Explanation:
Parasympathetic vagal fibers slow the SA node mainly through M2 muscarinic receptors.
MCQ 10
Question:
A patient has episodic hypertension, sweating, tremor, and palpitations due to excessive adrenal medullary secretion. Which chemical mediators are most responsible?
Options:
Acetylcholine and serotonin
Histamine and dopamine
Insulin and glucagon
Epinephrine and norepinephrine
Renin and angiotensin
Correct Answer:
Epinephrine and norepinephrine
Explanation:
The adrenal medulla releases catecholamines, mainly epinephrine and norepinephrine, which amplify sympathetic effects.
MCQ 11
Question:
A pharmacological agent stimulates beta-2 receptors. Which physiological response is most expected?
Options:
Bronchial smooth muscle relaxation
Increased intestinal peristalsis
Constriction of radial iris muscle
Slowing of SA node firing
Contraction of bladder detrusor
Correct Answer:
Bronchial smooth muscle relaxation
Explanation:
Beta-2 receptor activation relaxes bronchial smooth muscle and causes bronchodilation.
MCQ 12
Question:
In a practical viva, a student is asked why sympathetic ganglia are closer to the spinal cord. Which explanation is most appropriate?
Options:
They prevent adrenal medullary activation
They allow widespread postganglionic distribution
They eliminate the need for neurotransmitters
They restrict responses to single organs
They convert visceral signals into somatic signals
Correct Answer:
They allow widespread postganglionic distribution
Explanation:
Sympathetic ganglia near the spinal cord support broad distribution of postganglionic fibers to multiple body regions.
MCQ 13
Question:
A visceral pain impulse from an abdominal organ travels back toward the spinal cord mainly along which autonomic route?
Options:
Parasympathetic efferent fibers
Sympathetic afferent fibers
Somatic motor fibers
Cranial parasympathetic fibers
Postganglionic secretomotor fibers
Correct Answer:
Sympathetic afferent fibers
Explanation:
Many visceral pain afferents from thoracic and abdominal organs travel with sympathetic pathways to the spinal cord.
MCQ 14
Question:
A student links craniosacral outflow with digestion. Which effect best represents this link?
Options:
Reduced intestinal secretion
Increased gastrointestinal motility
Generalized vasoconstriction
Increased sweat production
Glucose release from liver
Correct Answer:
Increased gastrointestinal motility
Explanation:
Parasympathetic activity supports digestion by increasing gut motility and secretions.
MCQ 15
Question:
A lesion damages sympathetic outflow to blood vessels but spares skeletal muscle strength. Which finding is most likely?
Options:
Loss of voluntary movement
Impaired vascular tone
Increased tendon reflexes
Loss of pain from skin
Paralysis of diaphragm
Correct Answer:
Impaired vascular tone
Explanation:
Blood vessels are mainly regulated by sympathetic tone; damage reduces vasoconstrictor control without directly affecting skeletal motor power.
MCQ 16
Question:
A student compares the adrenal medulla with an autonomic ganglion. Which feature supports this comparison?
Options:
It receives preganglionic sympathetic input
It receives postganglionic vagal input
It releases acetylcholine at vessels
It controls skeletal muscle directly
It contains dorsal root neurons
Correct Answer:
It receives preganglionic sympathetic input
Explanation:
The adrenal medulla receives direct sympathetic preganglionic fibers and behaves like a modified sympathetic ganglion.
MCQ 17
Question:
A drug causes relaxation of bladder detrusor and helps urine storage. Which receptor is most likely involved?
Options:
Muscarinic M3 receptor
Nicotinic Nn receptor
Alpha-1 receptor
Beta-3 receptor
Muscarinic M2 receptor
Correct Answer:
Beta-3 receptor
Explanation:
Beta-3 receptors in the bladder detrusor promote relaxation, supporting urine storage.
MCQ 18
Question:
A patient develops pupil dilation during acute fear. Which autonomic mechanism best explains this change?
Options:
Alpha-1 activation of radial iris muscle
M3 activation of circular iris muscle
M2 inhibition of ciliary muscle
Beta-1 activation of lacrimal gland
Nicotinic blockade in ciliary ganglion
Correct Answer:
Alpha-1 activation of radial iris muscle
Explanation:
Sympathetic stimulation dilates the pupil by activating alpha-1 receptors on radial muscle of the iris.
MCQ 19
Question:
A person at rest has a heart rate lower than the intrinsic pacemaker rate. Which mechanism is mainly responsible?
Options:
Continuous adrenal catecholamine release
Baseline vagal discharge
Persistent alpha-1 activation
Reduced nicotinic transmission
Increased sympathetic cardiac tone
Correct Answer:
Baseline vagal discharge
Explanation:
Resting heart rate is kept below the intrinsic SA node rate mainly by parasympathetic vagal tone.
MCQ 20
Question:
A patient takes a drug that blocks alpha-1 receptors. Which clinical effect is most likely when the patient stands?
Options:
Improved venous return
Postural fall in blood pressure
Increased bronchial resistance
Marked increase in salivation
Enhanced bladder emptying
Correct Answer:
Postural fall in blood pressure
Explanation:
Alpha-1 blockade reduces sympathetic vasoconstriction, so standing may cause postural hypotension due to poor vascular resistance.
📌 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.