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Pacemaker of Heart

Which one of ...

Question

Which one of the following generates heart beat?

A

Purkinje fibres

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B

Cardiac branch of vagus nerve

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C

SA node

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D

AV node

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Solution

The correct option is C SA node
Sino-atrial node (SAN) generates the maximum number of action potentials per minute (70-75/min) and therefore, it sets the pace of the activities of the heart. Hence, it is called as the cardiac pacemaker.

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