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This muscle allows you to stand on tiptoe when the knee is extended, and it flexes the knee when the foot is dorsiflexed:

A) soleus
B) fibularis longus and brevis acting together
C) gastrocnemius
D) fibularis longus

User Mnd
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In the lower leg, the (C) gastrocnemius muscle crosses the ankle joint distally to insert on the calcaneus as well as the knee joint proximally to originate on the medial and lateral epicondyles of the femur
User Ruyili
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