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Musculoskeletal System - Coggle Diagram
Musculoskeletal System
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Skeletal muscle contraction:
- An action potential travels along a motor nerve to its endings on muscle fibres
- At each motor nerve ending the nerve secretes acetycholine
- ACh gated channels open
- Opening of ACh gated channels allow large quantities of sodium ionsto diffuse into the muscle fibre membrae
- The action caused depolarisation leading to opening of voltage gated sodium channels which initiates an action potential at the membrane
6.The action potential depolarizes the muscle membrane causing sarcoplasmic reticulum to release large quantities of Ca ions stored within the reticulum
7.The Ca ions produce to attractive forces to act between actin and myosin filaments, causing them to slide alongside each other leading to contractile process
- The Ca ions are pumped back into to sarcoplasmic reticulum by a Ca - membrane pump and remain stored in the sarcoplasmic reticulum until a new action potential occurs.
- The removal of Ca ions from the myofibrils causes muscle contractions to cease
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Sliding filament theory
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Thin filament - actin, tropomyosin
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