Write the difference betwwen red and white muscle fibre
Answers
Difference # Red Muscle Fibres:
1. These muscle fibres are dark red which is due to the presence of red haemoprotein called myoglobin. Myoglobin binds and stores oxygen as oxymyogiobin in the red fibres. Oxymyogiobin releases oxygen for utilization during muscle contraction.
2. Mitochondria are more in number.
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3. Red muscles have less sarcoplasmic reticulum.
4. They carry out considerable aerobic oxidation without accumulating much lactic acid. Thus red muscle fibres can contract for a longer period without fatigue.
5. These muscle fibres have slow rate of contraction for long periods.
Example: Extensor muscles of the human.
Difference # White Muscle Fibres:
1. These muscle fibres are lighter in colour as they do not have myoglobin.
2. Mitochondria are less in number.
3. White muscles have more sarcoplasmic reticulum.
4. They depend mainly on anaerobic oxidation (glycolysis) for energy production and accumulate lactic acid in considerable amounts during strenuous work and soon get fatigued.
5. These muscle fibres have a fast rate of contraction for short periods.
Example: Eye ball muscles.
Red muscle has a greater concentration of the pigment myoglobin, is generally lower in soluble protein content, lower in glycogen, and higher in lipid than white muscle. Red fibers are smaller in size than white fibers, are better supplied with capillaries, and contain more mitochondria.
. These muscle fibres are dark red which is due to the presence of red haemoprotein called myoglobin. Myoglobin binds and stores oxygen as oxymyogiobin in the red fibres. ... These muscle fibres have slow rate of contraction for long periods