Question

What are red fibres?

Answer 1

Red fibers:

1. Red muscle fibers get their name from the fact that they have a lot of capillaries, a lot of myoglobin, and a lot of mitochondria, which gives them a distinctive red look.
2. Red muscle fibers are smaller, have fewer myofibrils, and so contain more sarcoplasm and myoglobin than white muscle fibers.
3. The nucleus and Golgi apparatus are the same shape and structure in both types of fiber.
4. The amount of crista-rich mitochondria in red fibers is substantially higher than in white fibers.
5. These organelles are abundant between myofibrils and tend to congregate under the sarcolemma, causing the fiber surface to protrude somewhat.
6. Between mitochondrial groups, many lipid droplets can be distinguished.
7. Red fibers can perform aerobic oxidation without accumulating much lactic acid.
8. Hence, can contract for long periods and have a slow rate of contractions.