Assertion :Sino-atrial node (SAN) is called the pacemaker. Reason: SAN generates the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractions of the heart.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The sinoatrial node (SAN) is called the natural pacemaker of the heart. This is because the SAN generates the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractions of the heart.
Thus, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.'

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