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

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c9 to 12 m/sec

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dMore than 12 m/sec

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View Answer 1 to 4 m/sec

What is common between systemic and pulmonary circulation is_____________?


aVolume of the circulation per minute

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bPeripheral vascular resistance

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cPulse Pressure

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dTotal Capacity

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The function of Carotid body is_______________?


aMeasures the change in Po2 in arterial blood

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bMeasures Po2 in venous blood

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cMeasures the changed in CO2 in arterial blood

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dMeasures the change in CO2 in venous blood

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


aClosure of the pulmonary valve

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bRapid filling of the left ventricle

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cClosure of the aortic valve

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dContraction of the atria

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Parasympathetic stimulation of heart causes______________?


aSA node decreases firing

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bIncreased AV node excitability

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cDecreased ventricular contraction

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dTachycardia

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The ventricular repolarization in ECG is best seen in_______________?


a“P” wave

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b“Q” wave

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c“R” wave

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d“T” wave

✓


View Answer “T” wave

Cardiac output is a measure of______________?


aPeripheral resistance X tissue fluid

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bPeripheral resistance X cardiac rate

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cBlood pressure X cardiac rate

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dHeart rate X blood volume

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


aVenules

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bArterioles

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cCapillaries

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dPrecapillary sphincters

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View Answer Arterioles

Minimum blood pressure is in_____________?


aAorta

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bArteries

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cCapillaries

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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

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

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cBoth A and B

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dNone of the above

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View Answer Both A and B

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