adduction
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When the pectoralis major contracts eccentrically, it undergoes controlled lengthening. This action can assist in shoulder extension, as well as contribute to shoulder adduction from an abducted position.
quadriceps
Quadricepts
Flexing the thigh, extending the leg, adducts leg
The main action of the quadriceps or "quads" is walking. This muscle helps straighten the knee and maintain posture. Without this muscle, running, walking, and even standing would be quite impossible.
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The joint action in leg extensions is knee extension, where the angle between the thigh and lower leg decreases. The main muscles involved in this action are the quadriceps, specifically the vastus medialis, vastus lateralis, vastus intermedius, and rectus femoris. The movement primarily occurs at the knee joint.
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The quadriceps muscles of the anterior compartment of the thigh are responsible for the action of extending the knee. The quadriceps are actually four muscles all working together. They consist of the rectus femoris, the vastus lateralis, the vastus medialis, and the vastus intermedius.They are all monoarticulate, except the rectus femoris which is diarticulate, which means that it acts on two joints.
The Hamstrings consist of three muscles that have the same action: the Biceps Femoris, Semitendinosus and Semimembranosus. Their actions are to flex the knee joint, adduct the leg, and extend the thigh. The Quadriceps femoris is four muscles of the femur. They are the Rectus femoris, Vastus lateralis, Vastus medialis, and Vastus intermedialis. As a group (the quads) they extend the leg at the knee.