Inside a Muscle · Muscles
The smallest unit that can contract — repeated end to end, forever.
Zoom into a myofibril and you find the same tiny segment repeated over and over, end to end, like carriages on an endless train. That segment is the sarcomere — the smallest piece of you that can shorten.
There's more: the smallest unit that can contract — repeated end to end, forever. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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