Describe antagonistic muscles. How do muscles work as levers? Define origin and insertion

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Antagonistic muscles work in opposite directions. Your biceps muscle flexes your forearm, the triceps, on the other side of the arm, extends the forearm. Muscles are attached at specific spots; the origin is the area of bone where the muscle is attached that remains stationary when the muscle contracts. The insertion is the other end, where the muscle attaches to the bone that is moved. Muscles move bones like levers; the joint where the body part moves is the fulcrum, and the muscle provides the force for movement.

Biology & Microbiology

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