Which muscle is responsible for unlocking the kneecap while walking?
  1. Fibularis brevis
  2. Plantaris
  3. Biceps femoris
  4. 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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