Your skeletal (voluntary) muscles are signalled to contract by your nervous system, which is composed of your brain and nerves. In response to the message, your muscles tighten up (contract).
With the help of tendinous tissue, muscles are connected to bones and when they contract, they can cause movement around a joint. Spinal motor neurons, the last common pathway to the muscles, are controlled by the central nervous system to cause these movements. The tendon is pulled upon when the muscle contracts or gathers. Muscles are joined to bones by tendon.
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