Biology, asked by dhanushvinoth9179, 10 months ago

The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from
A) sinoatrial node B) QRS wave C) T wave D) hepatic portal system

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Answered by bavitha333

Answer:

The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart's pacemaker. ... vertebrate heart is myogenic (rhythmic contractions are an intrinsic property of the cardiac muscle cells themselves).

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