usmlebuzz
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can anyone tell 5 points of difference between type1 and 2 muscle fibers?
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| mjl1717
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I'm not sure if its me or the nomenclature,but I always see muscle divided into (smooth, cardiac or skeletal) or(red and white)
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| marcousmle
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type I RED.- has high concentration of mioglobin, many mitochondrias, uses aerobic glycolisis, it s speed of contraction is slow
Type II.- WHite
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| mjl1717
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White--large mass per motor unit, high ATPase,(fast muscle),anaerobic glycolysis, low myoglobin, eg.a sprinter or EOM of the eye.
less efficient.
Red--small mass per motor unit,low ATPase activity, aerobic,mitochondria is more efficient, high myoglobin (red color)
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| Quinn
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Type I is for maintaining posture and tension and wt. bearing...is aerobic...uses fatty acids.....has lots of mitochondria = red color, and is slow to fatigue.
Type II is for quick movements....is anaerobic....uses glycogen....very few mitochondria = white color, and fatigues rapidly.
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