Question

what is pacemaker in circulatory system?

Answer 1

Hi.



here is your answer.

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●the Heartbeat originated in modified cardiac muscles called sinoatrial node or SA node.


●SA node which lies in the Wall of right Atrium near the opening of superior Vena cava


●the s a node is called pacemaker because it has power of generation of wave of contraction


●the wave of contraction or cardiac impulse generated by SA node is conducted by cardiac muscles fibres to both the Atria causing their contraction


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Hope it helps you ☺