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It is the muscles that cause the body to move, by expanding and contracting by neural commands from the brain. The body moves, by expandong and contracting by neural command from the brain.
One's brain sends electrical signals to stimulate contraction and relaxation of muscles, thus enabling movement of limbs. when the brain sends the signal to the muscle it causes the muscle to contract and relax when wanted.

When one muscle contracts the other always relaxes as 2 muscles cannot contract at the same time.

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9y ago

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