People and other animals get energy from the food they consume. More specifically, animals oxidize carbohydrates via anaerobic and aerobic glycolysis. The processes lead to the formation of NADH and FADH2 that transfer electrons and protons to the electron transport chain in mitochondria where ATP is produced. ATP is directly hydrolyzed by myosins that allows moving of myosin heads and actin filaments. As a result, ATP serves as a source of energy for the myosin-actin movements and muscle contractions in animals.
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