Which structure initiates the heartbeat?

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Question

(C) The human heart is myogenic,meaning the heartbeat is initiated by specialized muscle cells. The $SA$ (Sinoatrial) node,located in the right atrium

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$SA$ node

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(C) The human heart is myogenic,meaning the heartbeat is initiated by specialized muscle cells. The $SA$ (Sinoatrial) node,located in the right atrium,acts as the natural pacemaker of the heart. It generates electrical impulses that spread through the heart muscle,causing it to contract and initiating the heartbeat. Therefore,the $SA$ node is responsible for initiating the heartbeat.

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