Question

difference between red muscle fibers and white muscle fibers​

Answer 1

Answer:

Answer:Red muscles have slow-twitch fibers which can contract slowly for a long period of time without fatigue. ... White muscles have fewer capillaries, myoglobin, and mitochondria. They have fast-twitch fibers, which can contract really fast, with a lot of force, but not for very long.

Answer 2

Answer:

Red Muscle fibres :

1. They have smaller diameter.
2. These muscle fibres are dark red in colour due to the presence of res haemoprotein called myoglobin. Myoglobin binds and stores oxygen as oxymyoglobin in the red fibres. Oxymyoglobin releases oxygen for utilization during muscle contraction.
3. Mitochondria are more in number.
4. They have more blood capillaries.
5. Red muscles have less sacroplasmic reticulum.
6. They carry out aerobic oxidation without accumulating much lactic acid. Thus, red muscle fibres can contract for a longer period without fatigue.
7. These muscle fibres have a slow rate of contraction for long period.
8. Example: Extensor muscles of the human back, Flight muscles of kites.

White Muscle fibres :

1. They have larger diameter.
2. These muscle fibres are lighter in colour as they do not have myoglobin.
3. Mitochondria are less in number.
4. They have less blood capillaries.
5. White muscles have more sacroplasmic reticulum.
6. They carry out anaerobic oxidation for energy production and accumulate lactic acid in considerable amount during strenuous work and soon get fatigued.
7. These muscle fibres have a fast rate of contraction for short periods.
8. Example: Eye ball muscle, Flight muscles of sparrow.