The sarcomere is the smallest contractile unit in our muscles. Through the sarcomere two proteins, actin and myosin, run through alternating in parallel. When a muscle contracts, small strucutres known as myosin heads, attach themselves to the binding site of the actin whereby it is pulled towards the center of the sarcomere making it shorter (contracted). Although one might intuitively think that ATP is needed to pull the sarcomere to the center, in this process ATP is needed to detach the myosin from the actin therby relaxing the sarcomere and muscle. Although, for the muscle to relax it previously has to be contracted- Therefore contracting muscles still inderectly causes the use of ATP.
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