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The hamstring muscles actively bend (flex) the knee. They also act to straighten or (extend) the hip (as in the motion of moving the thigh backward). Surprisingly, these large muscles are not very active with normal walking or standing. However, they are extremely important in power activities such as running, jumping, and climbing.
The Hamstrings consist of three muscles the Biceps Femoris muscle, the Semitendinosus muscle, and the Semimembranosus muscle.These muscles combined are primarily responsible for the flexion of the knee joint (bending of the knee) as well as assisting the extension of the thigh (moving the upper leg backwards).he origin attachment point of the Biceps Femoris muscle arises as two heads from the Ischial Tuberosity region of the pelvis as a tendon which is shares with the Semitendinous muscle.