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

Question

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The sinoatrial (SA) node is the structure in the heart that initiates action potentials that stimulate contraction of the heart at a constant rate of about 100 beats per minute. The SA node is located in the upper right atrium of the heart and is often referred to as the "pacemaker" of the heart.

Which Structure in the Heart Initiates Action Potentials That Stimulate