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Muscle fiber
From Wikipedia, the free encyclopedia
(Redirected from White skeletal muscle cell)
1. Axon
2. Neuromuscular junction
3. Muscle fiber
4. Myofibril
A muscle fiber (or muscle fibre), also known as a myocyte, is a single cell of a muscle. Muscle fibers contain many myofibrils, the contractile unit of muscles. Muscle fibers are very long; a single fiber can reach a length of 30cm.
Muscle fibers can be grouped according to what kind of tissue they are found in: skeletal muscle, smooth muscle, and cardiac muscle. The muscle cells of heart muscle tissue are called cardiomyocytes.
further divided, as follows:
| type | Type I | Type IIa | Type IIb |
| Description | slow oxidative (SO) fibers | fast oxidative-glycolytic (FOG) | fast-twitch glycolytic fibers |
| myoglobin | high | medium | low |
| mitochondria | many | moderate | few |
| fatigues | slowly | moderate speed | fast |
| color | red | red | white |
| diameter | narrow | medium | wide |
Type I muscle fibers (slow-oxidative fibers) use primarily cellular respiration and, as a result, they have relatively high endurance.
- http://www.coachr.org/fiber.htm - Article at coachr.org xplaining muscle fibers, especially in relation to training.
- Physiology at MCG 2/2ch6/2ch6obj
- Duke Orthopedics muscle_fiber_types
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| Topics | Muscular tissue • Muscle contraction • Muscles of the human body |
| Types of muscles | Cardiac muscle • Skeletal muscle • Smooth muscle |