Inside a Muscle · Muscles
Rods of contracting machinery packed inside each fibre.
Inside one muscle fibre are hundreds of thinner rods running its full length, packed together like cables in a conduit. These are myofibrils, and they're the parts that actually shorten.
There's more: rods of contracting machinery packed inside each fibre. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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