Step 1 - Nerve impulse reaches the axon terminal, Step 2 - Acetylcholine (ACh) is released into synapse, Step 3 - Acetylcholine (ACh) crosses synapse and binds to ACh receptors on the sarcolemma, Step 4 - Acetylcholine (ACh) causes a change in membrane permeability; generating action potential, Step 5 - Calcium ions are released from sarcoplasmic reticulum, Step 6 - Calcium binds to troponin, moves tropomyosin, exposing binding sites for myosin on actin, Step 7 - Myosin heads bind to actin forming cross bridges, Step 8 - Actin filaments are pulled toward center of sarcomere, Step 9 - The sarcomere shortens and the muscle contracts,

9 Steps of Muscle Contraction

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