Question

In resting stage normal activity of heart is regulated by A. nodal tissue of heart B. Medulla oblangata
C. Purkinje fibres
D. Branches of sympathetic and parasympathetic nervous system

Answer 1

Answer:

Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate.

Answer 2

Answer:

D. Branches of sympathetic and parasympathetic nervous system

Explanation: