The heart's natural rhythm, determined by its pacemaker in the absence of any input from the autonomic nervous system, is approximately beats per minute.

Name: The heart's natural rhythm, determined by its pacemaker in the absence of any input from the autonomic nervous system, is approximately beats per minute.
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The heart's natural rhythm, or intrinsic rate, set by the sinoatrial node (the heart's pacemaker) without autonomic nervous system input, is approximately 90 beats per minute.

The Heart's Natural Rhythm, Determined by Its Pacemaker in the Absence