Muscle contraction, and then make their organs are called (flexor) best muscle contraction, and then make a stretch called organs (extensor), such as the movement of arms and people. The structure of the arm (bicep) and consists of people (tricep) when shrinking the bicep tricep relaxes arm customers access. Thus, phachueng is a muscles, muscle does biodiesel services. Tricep muscles extensor muscles is.
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