Question

What is the heart's natural pacemaker?

Answer 1

Natural pacemaker of the heart:

1. The natural pacemaker of the heart is the sinoatrial node (SA node).
2. The impulse starts in the SA node.
3. The sinus node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium.
4. The electrical action propagates through the atria’s walls, causing its contraction.
5. This propels the blood into ventricles.
6. The SA node marks the rhythm and pace of the heartbeat.
7. The normal rhythm of the heart is usually called the normal sinus rhythm as the SA (sinus) node regularly fires.