Physiology MCQs

The first heart sound is produced by the_____________?

aClosure of the aortic and pulmonary valves

bOpening of the aortic and pulmonary valves

cClosure of the mitral and tricuspid valves

dOpening of the mitral and tricuspid valves

Normally, the rate of the heart beat in a human is determined by _________________?

aThe bundle of His

bAll cardiac muscle

cThe sinoatrial node

dThe cervical ganglion

View Answer The sinoatrial node

Stroke output of each ventricle in normal adult is_____________?

a30 ml

b130 ml

c70 ml

d5 liters

View Answer 70 ml

Cardiac output is not affected by __________________?

aHeart rate

bPeripheral resistance

cSystolic blood pressure

dVenous return

All the heart valves are open during which stage of cardiac cycle __________________?

aSystolic ejection

bIsovolumetric relaxation

cIsovolumetric contraction

dNone of the above

View Answer None of the above

Starling’s law of the heard________________?

aDoes not operate in the failing heart

bDoes not operate during exercise

cExplains the increase in cardiac output that occurs when venous return is increased

dExplains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

Peripheral resistance is maximum in_______________?





View Answer Arteriole

Increased functional demand on the heart produces increased size of the myocardium by _______________?



cFatty infiltration

dIncreased amounts of fibrous connective tissue

View Answer Hypertrophy

Absolute refractory period in heart______________?

aLasts till cardiac contraction

bLonger than refractory period in skeletal muscle

cA phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

dAll of the above

View Answer All of the above

Conduction velocity is least in_______________?

aAV node

bSA node

cSA node

dPurkinje fibers

View Answer AV node

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