Distinguish between red muscle fires and white muscle fibres,

Differences Red Muscle Fibre White Muscle Fibre Definition Red muscles are a type of skeletal muscle which are dense with capillaries and is rich in myoglobin and mitochondria. White muscles are also a type of skeletal muscle but contain lower amounts of myoglobin and mitochondria. Mitochondria More in number. Less in number. Sarcoplasmic Reticulum Less quantity of SR. More quantity of SR. Fatigue Can perform aerobic oxidation without accumulating much lactic acid – hence, can contract for long periods of time. Performs anaerobic oxidation and accumulates lactic acid much quicker than red muscles – hence, gets fatigued after short bursts of contraction. Rate of Contractions Slow rate of contraction. Fast rate of contraction. Example Extensor muscle. Muscles of the eyes.