physiology MCQs – Page 24

Practise focused physiology questions with marked answers for exam preparation and subject revision.

physiology Mcqs
461. Wallenberg degeneration is seen in______________?
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A. Proximal cut end of nerve with cell body

B. Distal cut end of nerve without cell body

C. Both the free ends of the cut nerve

D. All are true

462. First heart sound occurs during the period of________________?
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A. Isotonic contraction

B. Isotonic relaxation

C. Isovolumetric contraction

D. Isovolumetric relaxation

463. Closure of aortic valve occurs before the following event_______________?
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A. Isovolumetric contraction

B. Pre-systole

C. Pre-diastole

D. Isovolumetric relaxation
464. Coronary blood flow is usually predominantly controlled by_____________?
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A. Parasympathetic impulses

B. Sympathetic impulse

C. Hormones

D. Auto regulation
465. Pain sensation from the lateral extremities is transmitted by________________?
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A. Spinocerebellar tract

B. Spino thalmamic tract

C. Dorsal column

D. Corticospinal tract

466. Parasympathetic stimulation of heart causes______________?
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A. Increased AV node excitability

B. Decreased ventricular contraction

C. SA node decreases firing

D. Tachycardia

467. The largest function of the total peripheral resistance is due to _________________?
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A. Venules

B. Arterioles

C. Capillaries

D. Precapillary sphincters

468. Swallowing center is situated in_______________?
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A. Pons

B. MIdbrain

C. Cerebellum

D. Medulla
469. Sympathetic stimulation causes ______________?
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A. All of the above

B. Sweat secretion

C. Arteriolar constriction

D. Ciliary muscle contraction

470. Absolute period when whole heart is in diastole is______________?
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A. 0.4 seconds

B. 0.3 seconds

C. 0.7 seconds

D. 0.7 seconds

471. Consider the following statements________________?
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A. Starlings law of heart states that increase in force of contraction is directly related to cardiac ouput

B. Stalings law of heart states that the force of ventricular contraction is directly related to the end diastolic volume

C. Both A and B

D. None of the above

472. Normally, the rate of the heart beat in a human is determined by _________________?
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A. The sinoatrial node

B. The cervical ganglion

C. All cardiac muscle

D. The bundle of His

473. Cardiac output is maximum to _________________?
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A. Brain

B. Heart

C. Kidney

D. Liver
474. Pain is conducted by________________?
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A. A-delta fibers

B. A-beta fibers

C. A-alpha fibers

D. A-gamma fibers

475. Cardiac output in L/min divided by heart rate equals_______________?
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A. Cardiac efficiency

B. Mean stroke volume

C. Cardiac index

D. Mean arterial pressure

476. The dicrotic notch on the aortic pressure curve is caused by_________________?
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A. Rapid filling of the left ventricle

B. Closure of the pulmonary valve

C. Closure of the aortic valve

D. Contraction of the atria

477. Resting membrane potential of nerve fiber is_______________?
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A. -70 mv

B. -90 mv

C. -55 mv

D. + 35 mv

478. Neurotransmitter in nigrostrial pathway is_______________?
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A. GABA

B. Nor epinephrine

C. Acetyl choline

D. Dopamine
479. Starlings law of the heard________________?
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A. Does not operate in the failing heart

B. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

C. Does not operate during exercise

D. Explains the increase in cardiac output that occurs when venous return is increased
480. Cardiac index is related to ______________?
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A. cardiac output and body weight

B. Cardiac output and body surface area

C. Cardiac output and work of the heart

D. Stroke volume and pulse rate