Meet Your Muscles · Muscles
Tissue that shortens on command — and does nothing else.
A muscle is a bundle of tissue with exactly one talent: it can get shorter. Everything your body does that looks like movement — walking, blinking, swallowing, smiling — is some arrangement of things getting shorter at the right moment.
That shortening is called contraction, and it happens because millions of microscopic protein arms inside each muscle grab and pull in the same direction at once. Stack enough of them together and you can lift a suitcase.
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