Question

What causes the heart, in the absence of any external influences, to beat at the rate of 100 beats per min (bpm)

Answer 1

Answer:

Explanation:Vagal innervation of the heart

The electrical activity spontaneously generated by the sinoatrial node sets the pace for the rest of the heart. In absence of external stimuli, sinoatrial pacing generally maintains the heart rate in the range of 60–100 beats per minute (bpm).

Answer 2

Autorhythmic cells in the sinoatrial node of the heart generate action potentials at this rate (100 bpm).

What are Autorhythmic cells?

Autorhythmic cells are specialized cells in the heart muscle that mark the beat at the rate of 100 bpm.

• These cells (autorhythmic cells) are fundamental form the normal functioning of the heart.

In conclusion, autorhythmic cells in the sinoatrial node of the heart generate action potentials at this rate (100 bpm).

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