Flexion and extension movements do the quadriceps and hamstrings produce at the knee joint.
The correct option is A.
Skeletal muscles make up your hamstrings. Since they are voluntary muscles, you have control over how they function. Three hamstring muscles can be found at the back of each thigh. These muscles are used when you walk, climb stairs, squat, and carry out numerous other leg activities.
A hamstring injury frequently results from quick, forceful actions that overstretch your tendons or muscles, such running, lunging, or jumping.
The long head of the biceps femoris, short head of the biceps femoris, semitendinosus, and semimembranosus make up the hamstrings.
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