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When a muscle moves, several things have to happen at once. In the simplest form, let's say you are extending you hand in friendship and thus "stretching" your arm outward. The primary skeletal muscles in this movement would be the biceps brachii and it's companion, the triceps brachii. According to the 3rd Law of Motion, for every action there is an equal and opposite reaction. If the biceps contracts, the triceps relaxes and vice versa. To extend your arm the triceps will be in contraction and the biceps will be relaxed or "stretched out".

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