Heart's natural rhythm generator for contractions is called what?

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Multiple Choice

Heart's natural rhythm generator for contractions is called what?

The heart's natural rhythm generator is the pacemaker. This refers to the sinoatrial (SA) node in the right atrium, which spontaneously emits electrical impulses that set the pace and timing of heart contractions. These impulses coordinate the heartbeat, with the autonomic nervous system modulating the rate. Other terms don’t fit as well here: extensibility is about tissue stretch, not rhythm initiation; the risorius is a facial muscle; irritability means a tissue’s responsiveness but doesn’t specify the heart’s rhythm generator.

The heart's natural rhythm generator is the pacemaker. This refers to the sinoatrial (SA) node in the right atrium, which spontaneously emits electrical impulses that set the pace and timing of heart contractions. These impulses coordinate the heartbeat, with the autonomic nervous system modulating the rate. Other terms don’t fit as well here: extensibility is about tissue stretch, not rhythm initiation; the risorius is a facial muscle; irritability means a tissue’s responsiveness but doesn’t specify the heart’s rhythm generator.

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