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Explain why the SA node generates action potentials of approximately 100 beats per minute even though the average resting heart rate is 70 beats per minute?
Wiki User
∙ 14y ago
- The SA node will generate a bpm of about 100 bpm as it follows the pace that the faster cell set. It is up to the parasympathetic system to slow the pace according to the current state of physical and mental stimulation.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoI think it's because of the longer refractory period of cardiac muscle. The heart beat has to have completed before the end of the refractory period, so the heart cannot tetanize.
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6 Explain why the SA node generates action potentials at a frequency of approximately 100 beats per minute even though the average resting heart rate is 70 beats per minute?
This is because parasympathetic nerve innervation synapsing in the SA node reduces heart rate from 100bpm to 70bpm as its basal tone
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