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USMLE Exam Prep

Category - Free USMLE Practice Test Questions

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Which muscle is responsible for unlocking the kneecap while walking?

Fibularis brevis
Plantaris
Biceps femoris
Sartorius

Explanation

Answer: B - The muscle responsible for unlocking the knee while walking is the plantaris muscle. It also assists in plantarflexion of the ankle and flexion of the knee. It is often used as a source for tendons when grafting is necessary.

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