Physiology MCQs

Page No. 3

The velocity of conduction in the Purkinjie fibers of the heart is__________________?


a1 to 4 m/sec


b5 to 8 m/sec


c9 to 12 m/sec


dMore than 12 m/sec


View Answer 1 to 4 m/sec

What is common between systemic and pulmonary circulation is_____________?


aVolume of the circulation per minute


bPeripheral vascular resistance


cPulse Pressure


dTotal Capacity



The function of Carotid body is_______________?


aMeasures the change in Po2 in arterial blood


bMeasures Po2 in venous blood


cMeasures the changed in CO2 in arterial blood


dMeasures the change in CO2 in venous blood



The dicrotic notch on the aortic pressure curve is caused by_________________?


aClosure of the pulmonary valve


bRapid filling of the left ventricle


cClosure of the aortic valve


dContraction of the atria



Parasympathetic stimulation of heart causes______________?


aSA node decreases firing


bIncreased AV node excitability


cDecreased ventricular contraction


dTachycardia



The ventricular repolarization in ECG is best seen in_______________?


a“P” wave


b“Q” wave


c“R” wave


d“T” wave


View Answer “T” wave

Cardiac output is a measure of______________?


aPeripheral resistance X tissue fluid


bPeripheral resistance X cardiac rate


cBlood pressure X cardiac rate


dHeart rate X blood volume



The largest function of the total peripheral resistance is due to _________________?


aVenules


bArterioles


cCapillaries


dPrecapillary sphincters


View Answer Arterioles

Minimum blood pressure is in_____________?


aAorta


bArteries


cCapillaries


dVenules


View Answer Venules

Consider the following statements________________?


aStarling’s law of heart states that increase in force of contraction is directly related to cardiac ouput


bStaling’s law of heart states that the force of ventricular contraction is directly related to the end diastolic volume


cBoth A and B


dNone of the above


View Answer Both A and B

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