write the difference between red and white muscle
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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.
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.
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.
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.
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.
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.
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White Skeletal Muscles:
Light coloured fibres having very less quantity of myoglobin and a few mitochondria.
Amount of sarcoplasmic reticulum is high in them.
Meant for fast and strenuous physical activity over a short duration as they get tired soon.
For example: Biceps of arms, flight muscles of fast flying birds (sparrow).
Red skeletal muscles:
Also known as aerobic muscles.
Dark coloured striated fibers rich in myoglobin and mitochondria.
Undergo slow sustained contraction over a long period without getting fatigue due to non-formation of lactic acid.
For example: Back muscles in human, flight muscles of certain birds (kite).
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