Given below are two statements. One is labelled Assertion (A), and the other is labelled Reason (R).
Assertion (A): The contraction of smooth muscles is not under conscious control.
Reason (R): Smooth muscles lack striations that are characteristic of skeletal and cardiac muscles.
In light of the above statements, choose the correct answer from the options given below.

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

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

Both (A) and (R) are false.

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

answer is B.

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Detailed Solution

(A) is true. The contraction of smooth muscles is involuntary and not subject to conscious control by the individual.

(R) is true. Smooth muscles lack the visible striations, or alternating dark and light banding patterns, that are characteristic of skeletal and cardiac muscles.

(R) does not explain (A). The absence of striations in smooth muscles does not contribute to their involuntary nature. Their contraction is involuntary since they are innervated by autonomic nerve fibres rather than somatic nerve fibres.

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