What action(s) do the gracilis, hamstring, and sartorius muscles perform on the lower leg?
A)flex the leg at the knee joint
B)extend the leg at the knee joint
C)a and b
D)The muscles listed do not move the lower leg.

Question

Quizplus · Accepted Answer

The gracilis, hamstring, and sartorius muscles are involved in flexing the leg at the knee joint. The hamstrings are a group of three muscles (biceps femoris, semitendinosus, and semimembranosus) that are primarily responsible for knee flexion. The sartorius muscle also assists in flexing the knee, and the gracilis helps in this action as well. None of these muscles extend the leg at the knee joint; that action is primarily performed by the quadriceps femoris muscle group.

What Action(s) Do the Gracilis, Hamstring, and Sartorius Muscles Perform