Muscle contraction

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muscle contraction Cross Bridge Cycle, Skeletal Muscle Contraction, Mechanism Of Muscle Contraction, Sarcomere Diagram, Muscle Contraction Steps, Actin Myosin, The Muscular System, Teas Test, Muscle System

When a muscle is ready to contract, calcium in the muscle fibers exposes myosin-binding sites on actin filaments. Actin−myosin cross-bridges form. By hydrolyzing ATP, myosin heads push up against actin fibrils, contracting the sarcomere. Calcium and ATP presence enables cross-bridge cycling.

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