Slow Twitch: have a longer contraction-relaxation cycle, have a smaller store of calcium ions in the sarcoplasmic reticulum, obtain ATP mostly from aerobic respiration, There is a greater number of larger mitochondria near the surface, There is a slower rate of ATP hydrolysis in myosin heads, more resistant to fatigue as less lactate is formed, High in myoglobin, Fast Twitch: obtain ATP mostly from anaerobic respiration, have a larger store of calcium ions in the sarcoplasmic reticulum, There is a faster rate of ATP hydrolysis in myosin heads, Low in myoglobin, Large store of glycogen phosphate,

Slow and Fast Twitch Muscle Fibres

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