Muscles and Bones · Muscles
Tough, barely stretchy cords that deliver the pull to bone.
Muscle is soft. Bone is hard. Between them runs something that has to be neither — a tendon: a dense, rope-like cord that barely stretches, because anything springy would waste the pull.
There's more: tough, barely stretchy cords that deliver the pull to bone. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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