Assertion :Triceps is said to be an extensor muscle for elbow joint. Reason: Triceps relax during extension of forearm at the elbow joint.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Biceps and triceps are part of the forearm. Biceps are the upper part of the forearm while the triceps is the lower part of the forearm. Both the muscles work simultaneously at the elbow joint. When one muscles contract other relaxes and vice versa. During the extension of the forearm, the triceps contract and make the joint stable. These triceps are said to be extensor muscles for elbow joints as they help in the extension of the forearm and work antagonistically to the biceps.
So, the correct option is 'Assertion is correct but Reason is incorrect'.

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