Assertion : Muscle fibres of SA node possess | vedclass

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(D) The $SA$ node (sinoatrial node) is known as the natural pacemaker of the heart. It consists of specialized cardiac muscle fibres that possess the

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If the Assertion is incorrect but the Reason is correct.

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(D) The $SA$ node (sinoatrial node) is known as the natural pacemaker of the heart. It consists of specialized cardiac muscle fibres that possess the highest rhythmicity,not the lowest. Because of this high rhythmicity,it can generate excitatory impulses at the fastest rate,which sets the pace for the entire heart. Since the assertion states that the $SA$ node has the lowest rhythmicity,the assertion is incorrect. However,the reason correctly identifies that it initiates excitatory waves at the highest rate. Therefore,the assertion is incorrect,but the reason is correct.

Assertion : Muscle fibres of $SA$ node possess the lowest rhythmicity among all cardiac muscles.
Reason : Due to this fact,it can initiate excitatory waves at the highest rate.

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Assertion : Muscle fibres of $SA$ node possess the lowest rhythmicity among all cardiac muscles.Reason : Due to this fact,it can initiate excitatory waves at the highest rate.