Question

What is a role of the pacemaker or sinoatrial node (SAN)?

A. To initiate contraction of the ventricle
B. To pass the excitation through Purkinje fibres
C. To originate excitation in myogenic muscle
D. To cause the relaxation of the atria

Answer 1

C. To originate the excitation in the myogenic muscle. The SA node initiates the electrical impulse that goes through the heart and causes the depolarization of the right atrea

Answer 2

The role of the pacemaker or sinoatrial node (SAN) is to C) To originate excitation in myogenic muscle.