Fast T Fibres : Short contraction - relaxation cycle, Fewer capillaries , ATP supplied mostly from anaerobic respiration , Fewer, smaller mitochondria present, Large store of calcium ions in the sarcoplasmic reticulum , Large amounts of glycogen and phosphocreatine present, Faster rate of ATP hydrolysis in myosin heads, Fatigues rapidly due to greater lactate formation , Slow T Fibres : Long contraction - relaxation cycle, Denser network of capillaries, ATP supplied mostly from aerobic respiration , Many, large mitochondria present, Small store of calcium ions in the sarcoplasmic reticulum , small amounts of glycogen present, slower rate of ATP hydrolysis in myosin heads, Fatigues more slowly due to reduced lactate formation ,

CAX KS5 Fast twtich VS slow twitch muscle fibres

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