Question

Why sino-atrial node is also called as pacemaker?​

Answer 1

The SA (sinoatrial) node is called pacemaker because it contains a group of cells in the wall of the right atrium that have the ability to spontaneously initiate the electrical impulse that leads to the contraction of the heart.

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Answer 2

hey mate...

here is your answer...

The SA node is sometimes called the heart's “natural pacemaker.” In other cases, the heart's electrical pathways are blocked, which can also cause an irregular heart rhythm.When an electrical impulse is released from this natural pacemaker, it causes the upper chambers of the heart (the atria) to contract.

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