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Muscular System (muscles (pectoralis major (location: sternum, action:…
Muscular System
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sliding filament theory
- myosin attaches to actin forming actin/ myosin crossbridges
4.myosin head moves toward M line of sarcomere, pulling actin filaments past myosin
- Ca++ binds to actin mylofilament, exposing the myosin binding site
- this action is repeated many times powered by ATP
- nerve impulse or action potential travels down sarcolemma and into t-tubules, causing sarcoplasmic reticulum to release Ca++ into sarcoplasm.
- Z lines get closer together as actin and myosin filaments slide past each other, and sarcomeres shorten (H zone disappears), shortening the entire myofibril.
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