Question

Assertion :Assertion : Biceps and triceps are antagonistic muscles. Reason: Reason : The biceps flexes the arm and the triceps straightens the arm.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion Is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

The correct option is A If both assertion and reason are true and reason is the correct explanation of assertion.

A muscle can pull a part of the body by its contraction. The body muscles are arranged in antagonistic pairs. Muscles in a pair moves the body part in one direction and another in opposite direction. For example, the muscle named bicep bring the forearm towards the upper arm and the muscle called the tricep to move the forearm away from the upper arm.

As the biceps contract to cause movement, the triceps relax to allow the movement to occur and vice versa. This is the flexor and extensor kind of muscles. Muscles that bend one part over another joint is known as a flexor muscle. Extensor muscle is antagonist which contracts cooling one of the articulated bone apart from another.

So, the correct option is 'If both assertion and reason are true and the reason is the correct explanation of assertion.'