Paralysis of which of the following muscles would make an individual unable to flex the knee?

Question

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The hamstring muscles are responsible for flexing the knee joint. If they are paralyzed, an individual would be unable to flex the knee. Gluteal muscles are responsible for hip extension, brachioradialis for forearm flexion, and soleus for ankle plantar flexion, none of which are directly involved in knee flexion.

Paralysis of Which of the Following Muscles Would Make an Individual