How a Muscle Contracts · Muscles
Energy is needed for each grab — and for every let-go.
Every one of those myosin arms needs an energy molecule called ATP to complete its stroke. Billions of arms, cycling several times a second — muscle is by far your body's biggest energy customer during exercise.
There's more: energy is needed for each grab — and for every let-go. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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