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Why is the sinoatrial node called t...

Why is the sinoatrial node called the pacmaker of heart ?

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Although impulse is produced by the entire neuro muscular pathway, the frequency of impulse generation is maximum in case of sino atrial node in comparison to other parts of pathway . Hence it guides the rhythm of heat beat and is called the pacemaker of the heart .
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Assertion : Sino-atrial node (SAN) is called the pacemaker Reason : SAN generates the maximum number of action potentials and is responsible for intiating and maintaining the rhythmic contractions of the heart.

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