Question

what triggers the movement of muscles​

Answer 1

Answer:

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Answer 2

Answer:

A muscle cell (fibre) is made up of myofibrils, bundles of protein that include actin and myosin. Muscle movement is powered by a change in shape of the myosin. The myosin head binds to actin and breaks down ATP. The myosin heads tilt, which pulls up the actin and causes the muscle to contract.

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