Question

What is the role of sino atrial node in the human heart? Why is it known as the pacemaker of human heart? ​

Answer 1

Answer:

Explanation:

The main role of a sinoatrial node cell is to initiate action potentials of the heart, so that it can pass throughout the heart and cause contraction. An action potential is a change in voltage (membrane potential) across the membrane of the cell, produced by the movement of charged atoms (ions). Non-pacemaker cells (including the ventricular and atrial cells) have a period, immediately after an action potential, where the membrane potential remains relatively constant; this is known as a resting membrane potential. This resting phase (see cardiac action potential, phase 4) ends when another action potential reaches the cell.

Answer 2

Explanation:

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