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 people, arms, arm's structure consists of people (bicep) and (tricep) when shrinking bicep tricep relaxes arm customers access. Thus, phachueng is a muscles, muscle does biodiesel services. Phachat is a muscles of extensor muscles in Q1.
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