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Muscle grows larger from exercise because more muscle filaments are created within each cell. There are thick myosin filatments and thin actin filaments which form cross bridges with each other. The heads of the thick filaments undergo a power stroke in which they bind to the thin filaments and the head bends down, pulling the thick filament across the thin filament, shortening the muscle and creating tension.

Think of a pulling a car with a rope. you are the thick filament, the rope is the thin filament. You grab the rope and pull, and then move your hands down the rope and do it again, this is like the power stroke. Now, add more people and more ropes, you can pull a much heavier load. That is how the muscle gets stronger.

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16y ago

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