Final answer:
The triceps brachii muscle primarily functions as an extensor for elbow extension.
Explanation:
The triceps brachii muscle functions as an extensor of the forearm, specifically involved in elbow extension. When the triceps brachii contracts, it straightens the arm at the elbow joint by pulling the insertion towards the origin. Acting antagonistically to the biceps brachii muscle, which is a flexor, the triceps brachii allows for movements such as extending the arm or straightening it.
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