The initiation of the contraction and relaxation of the heart and regulation of the heartbeat rate are carried out by the special muscles of ___.

bicuspid valve

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sinoatrial node

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pulmonary valve

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atrioventricular node

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Solution

The correct option is A
bicuspid valve

The continuous and rhythmic beating is a characteristic feature of the heart. Initiation of the contraction and relaxation of the heart and regulation of the heartbeat rate are carried out by the special muscles of Sino Atrial Node (SA node) at the anterior part of the right atrium. This part is called the heart's “natural pacemaker”.

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