The rhythmic contraction and relaxation of the heart muscles is initiated by a tissue called ______________.

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Solution

Sinoatrial node:
It is also known as the natural pace maker.
It sends the electrical signal that causes the heart to beat regularly.
Final answer: The rhythmic contraction and relaxation of the heart muscles is initiated by a tissue called Sinoatrial node.

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The rhythmic contraction and relaxation of heart muscles is known as ________.

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