This structure in the heart initiates action potentials that stimulate contraction of the heart at constant rate of about 100 beats per minute.

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The sinoatrial node (also known as the SA node) is a small structure located in the right atrium of the heart. It is often referred to as the "pacemaker" of the heart because it generates electrical impulses that stimulate contraction of the heart muscles at a constant rate of about 100 beats per minute.

This Structure in the Heart Initiates Action Potentials That Stimulate