Which of the following muscles extends the forearm at the elbow joint?
a. brachioradialis m
b. triceps brachii m.
c. biceps brachi m.
d. brachialis m.

Biceps brachii muscle.

Explanation:

Biceps brachi muscle is present in between the elbow and shoulder of the upper arm. The head of this muscle arise from the scapula.

Biceps brachii muscles form the interior compartment of the shoulder. The main function of the bicep brachii muscle is the flexion and extension of forearm at the elbow joint of the muscle.

Thus, the correct answer is option (c).

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