Which muscle group are primarily responsible (agonist role) for the following movements?i. Flexion of the knee. ii. Extension of the knee. iii. Abduction of the shoulder
Question
Which muscle group are primarily responsible (agonist role) for the following movements?i. Flexion of the knee. ii. Extension of the knee. iii. Abduction of the shoulder
Solution
i. Flexion of the knee:
- The primary muscle group responsible for the flexion of the knee is the hamstrings. The hamstrings consist of three muscles: the biceps femoris, semitendinosus, and semimembranosus.
ii. Extension of the knee:
- The primary muscle group responsible for the extension of the knee is the quadriceps. The quadriceps consist of four muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
iii. Abduction of the shoulder:
- The primary muscle group responsible for the abduction of the shoulder is the deltoid muscle, particularly the middle fibers of the deltoid. The supraspinatus muscle also assists in the initial phase of shoulder abduction.
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