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

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

Locomotion and Movement

Solution:

Some muscles are arranged in sets of two and act in opposition to bring movement. Such muscles are called antagonistic muscles. For example, the biceps bends or flexes the arm and its antagonist, the triceps straightens or extends the arm.