Question

Which muscle is called the pacemaker of the heart? Why?

Answer 1

Pacemakers. Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's “natural pacemaker.”

Answer 2

Answer:

The ‘sinoatrial node’ is known as the ‘pacemaker of the heart’.  

Explanation:

This muscle is composed of a group of cells that initiate the contraction of the heart hence it is known as the pacemaker.

The initiation of contraction of the heart muscles is initiated by an electrical impulse that triggers the pace cells to set the pace or heart rate which is the rate at which blood is pumped from the heart. The sinoatrial node initiates this electrical signal that causes the ‘heart to contract’ and ‘pump blood’.