Which muscle extends the knee and is part of the quadriceps group?

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Multiple Choice

Which muscle extends the knee and is part of the quadriceps group?

Extending the knee is a primary action of the quadriceps femoris group, which sits on the front of the thigh and straightens the leg when it contracts. Vastus medialis is one of the four muscles in this group, so it clearly fits the description by both belonging to the quadriceps and contributing to knee extension. The other muscles listed don’t extend the knee: the tibialis anterior mainly dorsiflexes the foot, and the gastrocnemius, though crossing the knee, mainly plantarflexes the ankle and can assist in knee flexion rather than extension.

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