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Answered

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What tells a muscle when to contract?​

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Answer:

What tells a muscle when to contract?​

Explanation:

(1) A message travels from the nervous system to the muscular system, triggering chemical reactions.

(2) The chemical reactions lead to the muscle fibers reorganizing themselves in a way that shortens the muscle--that’s the contraction.

(3) When the nervous system signal is no longer present, the chemical process reverses, and the muscle fibers rearrange again and the muscle relaxes.

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Answer:

The nervous system generates a signal, which triggers a muscle to contract

Explanation:

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