First slide

Regulation of Cardiac Activity

Question

Normal activities of the heart are regulated by

Easy

A

Neural signals through the sympathetic nerves
B

Epinephrine secreted by the adrenal medulla
C

ANS and adrenal corticoid hormones
D

The nodal tissue intrinsically

Solution

Human heart is myogenic i.e. the normal activities are regulated intrinsically by nodal tissue. Autonomic nervous system and adrenal medullar hormones (eg., epinephrine) are involved in moderating the cardiac activity when need arises.

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