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Question

Assertion :The SA node acts as pacemaker. Reason: The SA node is located in the wall of the right atrium near the inter-atrial septum.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
SA node is considered as the natural pacemaker of heart as it is responsible for generating electrical impulses for the continuous rhythmic beating of the heart. The initiation of heartbeat takes place by the contraction of the walls of SA node itself which is then passed on to other parts of the heart. SA node is situated in the upper right corner of the heart in the right atrium. So, the correct answer is option B.

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