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Muscles are made up by thousands of fibbers that can contract

As muscles contract then relax they move the bones and limbs at the joint

Muscles also work in pairs

When one muscle contract the other muscle controls the opposite action will need to relax

Muscles are made up by thousands of fibers that can contact

As muscles contact then relax they move the bones and limbs at the joint

Muscles also work in pairs

When one muscle contract the other muscle controls the opposite action will need to relax

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14y ago

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