Question

Sino-atrial node is called the pacemaker of our heart. why?
IN SIMPLE WORDS!!​

Answer 1

Explanation:

The cardiac impulse originating from the SA node triggers a sequence of electrical events in the heart thereby controlling the sequence of muscle contraction that pumps blood out of the heart.

Answer 2

Answer:

Heart beat originates from SA and spread to walls of auricle which contract .It generate electrical impulses that causes heart to contract and pumb blood to all over body.

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