TRUE regarding human heart

A. Conduction of impulse from endocardium to inwards

B. During exercise duration of systole is reduced more than diastole

C. HR increases with parasympathetic denervation

D. Vagal stimulation decreases force of contraction

Correct Answer: HR increases with parasympathetic denervation

Description: In resting state, the heart is under vagal control. But when there is vagal denervation, the sympathetic activity is unhindered and the heart rate increases. Conduction is from endocardium to epicardium. During exercise, the duration of diastole is more decreased than systole. Vagal stimulation does not decrease the force of contraction.

Category: Physiology

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