Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A) : Actin filaments are called thin filaments.
Reason (R) : They are thinner than the myosin filaments.
In light of the above statements, choose the correct answer from the options given below.

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

Both (A) and (R) are false.

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

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

answer is A.

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Detailed Solution

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

Assertion (A) is correct. Actin filaments are indeed referred to as thin filaments due to their smaller diameter compared to myosin filaments.

Reason (R) is also true. Actin filaments have a diameter of about 7 nanometers, while myosin filaments have a larger diameter of about 15 nanometers. This size difference is significant, leading to the designation of actin filaments as thin filaments.

In summary, actin filaments are called thin filaments because they are thinner than myosin filaments. This size difference is notable and contributes to the functional characteristics of these filaments within the sarcomeres of muscle cells.

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