5. Antagonistic muscle action chart Hip joint and pelvic girdle Complete the chart by listing the muscle(s) or parts of muscles that are antagonist in their actions to the muscles in the left column. Agonist Antagonist Chapter Gluteus maximus Gluteus medius Gluteus minimus Biceps femoris Semimembranosus/Semitendinosus Adductor magnus/Adductor brevis Adductor longus Gracilis Lateral rotators Rectus femoris Sartorius Pectineus Iliopsoas Tensor fasciae latae 259

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Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.