What is the action of the Vastus Intermedius?

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Multiple Choice

What is the action of the Vastus Intermedius?

Explanation:
The action being tested is knee extension. Vastus intermedius is one of the quadriceps muscles, lying deep to the rectus femoris on the front of the thigh. When the quadriceps contract, they pull on the patellar tendon, which straightens the knee. This muscle crosses the knee joint but not the hip, so its main role is extending the knee rather than moving the hip. It does not flex the knee or cause tibial rotation; those are handled by other muscles. Therefore, extending the knee is the best description of its action.

The action being tested is knee extension. Vastus intermedius is one of the quadriceps muscles, lying deep to the rectus femoris on the front of the thigh. When the quadriceps contract, they pull on the patellar tendon, which straightens the knee. This muscle crosses the knee joint but not the hip, so its main role is extending the knee rather than moving the hip. It does not flex the knee or cause tibial rotation; those are handled by other muscles. Therefore, extending the knee is the best description of its action.

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