Question

Difference between Red fibres and white fibres

Answer 1

Red 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.

1. White 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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Answer 2

ANSWER :-

The difference between red and white muscle fibres is as follows -

Red Muscle Fibres :-

• Red muscle fibres have a thin structure.

• Red muscle fibres are dark in colour.

• Red muscle fibres have a slow rate of contraction.

• Red muscle fibres are rich in mitochondria.

• Red muscle fibres are rich in myoglobin.

• Red muscle fibres possess the ability to perform slow and sustained contractions for a long period of time without fatigue.

White Muscle Fibres :-

• White muscle fibres have a thick structure.

• White muscle fibres are light in colour.

• White muscle fibres have a fast rate of contraction.

• White muscle fibres are poor in mitochondria.

• Myoglobin is completely absent in the white muscle fibres.

• White muscle fibres possess the ability to perform fast and strenuous activities for a short period of time, followed by fatigue.