a.
To determine: The muscles in the given chart, which acts as agonists in hip extension.
Introduction: In an animal body, a muscle tissue is a well-vascularized soft tissue present in the muscles. A muscle tissue is formed of specialized cells called myocytes (consists of contractile proteins) that are generally attached with bones, which enables the movement of different parts of the body. Different muscles are present in the pelvic girdle, which are responsible for the extension, lateral movement, and medial movement. They are gluteus maximus, hamstrings, and gluteus minimus.
b.
To determine: The motion that must be neutralized so the agonists can do only hip extension.
c.
To determine: The muscle must act as a neutralizer to rule out the undesired motion.
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