Inside a Muscle · Muscles
Two proteins: thin ropes, and thick ropes with grabbing arms.
Inside every sarcomere sit two kinds of filament. Thin ones made of actin, anchored at each end. Thick ones made of myosin in the middle, covered in tiny arms that can reach out and grab.
There's more: two proteins: thin ropes, and thick ropes with grabbing arms. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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