Physiology MCQs

Page No. 1

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_______________?


aAorta


bArtery


cArteriole


dVein


View Answer Arteriole

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


aHyperplasia


bHypertrophy


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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