Sino-atrial node is also called of the heart.

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Solution

The correct option is B pacemaker
Sino-atrial (SA) node is a cluster of conducting cells present in the right atrium. It has the capability to generate action potential that drives the contraction and relaxation of the heart muscles. So, SA node is also called as the pacemaker of the heart.

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Sino-atrial node is called the pacemaker of our heart. Why?

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