Question

State the main function of the following:

Sinoatrial node

Answer 1

Sinoatrial node:

1. The heartbeat refers to the rhythmic contraction and relaxation of the atria and ventricles.
2. The origin of the heartbeat starts from a particular region in the heart called the sinoatrial (SA) node.
3. SA node is found in the upper part of the right atrium.

The main function of the sinoatrial node:

1. SA node act as the pacemaker by initiating impulses that spread through the walls of the atria and, after a short delay, through the ventricular walls via the atrioventricular (AV) node.