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How can muscles work in pairs

muscles work in pairs

Muscles actually work in pairs. A muscle can only pull in one direction so it needs another muscle to pull in the opposite direction in order to return a bone to its original position. When you lift your forearm, the biceps muscle shortens to lift the bone.

When you straighten your arm the triceps muscle pulls it back again and the biceps relaxes. The same action takes place in your legs when you walk and run, and when you move your fingers and toes.

Interactive body

Muscles game

Facts and features

Muscle anatomy diagram - front view

Muscle anatomy diagram - back view

Muscles and Exercise

Facial Muscles

Fast and slow twitch muscles

Structure and contraction

Muscle tone

Skeletal, smooth and cardiac muscle

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