What the biceps and triceps are doing as the forearm moves up and down?.

Your elbow piece has two muscles that move your forearm up or down. These are the biceps on the head of the upper arm and the triceps on the back of the upper arm: to lift the forearm, the biceps contracts and the triceps relaxes. to lower the forearm again, the triceps contracts and the biceps relaxes.

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its d i know cause i've been googling it