APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The hamstrings are the agonist and the quadriceps are the antagonist . In the contact and recovery phase, the quadriceps contract to extend the knee while the hamstrings lengthen to allow the movement.

Detailed explanation-2: -These terms are reversed for the opposite action, flexion of the leg at the knee. In this case the hamstrings would be called the agonists and the quadriceps femoris would be called the antagonists.

Detailed explanation-3: -The Biomechanical Yin/Yang The hamstrings stretch when the knee extends and so are the antagonists for this action. The hamstrings become the agonist muscle when the knee bends and the quadriceps become the antagonist.

Detailed explanation-4: -The quadriceps muscle group is the antagonist of the hamstring muscle group.

Detailed explanation-5: -Biceps & Triceps To recap, as we flex (or curl) our arm, the bicep functions as the agonist muscle during its contraction, whereas the tricep is the antagonist muscle, as it relaxes. As we uncurl or relax our arm, these roles are reversed, with the bicep becoming the antagonist, and the tricep the agonist muscle.