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How do my muscles work?

Muscles work by moving in harmony with one another. When one muscle gets a message to tighten, its opposite muscle gets told to relax. This means that muscles work in harmony when they move. The brain tells muscles which ones should tighten and which ones should relax. The brain sorts out the messages that go to the muscles. Once they’re sorted, the messages go from the brain to the muscles telling them what to do.

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