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Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion-(A): Cardiac muscle fibres contract as a single unit when stimulated.
Reason-(R): Gap junctions in the intercalated discs of cardiac muscle allow rapid transfer of ions to adjacent cardiac muscle fibres.
In light of the above statements, choose the correct answer from the options given below.

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(A) is false and (R) is true.

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are true and (R) is the correct explanation of (A).

answer is C.

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Detailed Solution

Gap junctions are seen in intercalated discs of cardiac muscle. They allow ion transfer and cause simultaneous contraction.

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