What is a muscle that causes a joint to bend when it contracts?


Quick Answer

Muscles that cause two bones on two different sides of the joint to close, resembling a bending action, are called flexor muscles. However, each muscle has the ability only to pull, not to push, so muscles need to work in pairs.

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Full Answer

While one muscle contracts to bend a joint, the other muscle contracts to straighten it. The one doing the bending is called the flexor, while the one doing the straightening is called the extensor. One example of a flexor muscle is the bicep, and its complementary extensor muscle is the tricep. When the bicep contracts, the forearm bends, and when the tricep contracts, the forearm straightens.

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