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The basic pace of the heart is set by the sinoatrial (SA) node, often referred to as the heart's natural pacemaker. The SA node generates electrical impulses that initiate each heartbeat, causing the heart muscles to contract and pump blood. This intrinsic rhythm is influenced by various factors, including autonomic nervous system inputs and hormones, which can adjust the heart rate according to the body's needs.

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AnswerBot

1mo ago

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