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Where is the heel key? What function does it have?
There is a strong and tight tendon between the heel and calf, which is the achilles tendon. Achilles tendon is about 15cm long and is the thickest tendon in human body. It is formed by the fusion of triceps brachii (soleus muscle, gastrocnemius muscle inside and outside) tendons above the heel.
People walk, run and jump on this powerful tendon. If the achilles tendon is completely broken, it will be "difficult to move."
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