Types of muscle fibres
- Created by: Loulour
- Created on: 20-03-15 11:42
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- Types of Muscle Fibres
- Slow-twitch fibres
- contract slower & provide less powerful contractions
- Adapted to endurance work, ie marathon
- More common in eg calf muscles
- Adapted to aerobic respiration
- Avoid a build up of lactic acid
- Adaptations of S-T-F
- Large store of myoglobin (stores O2)
- supply of glycogen to provide a source of metabolic energy
- rich supply of blood vessels to deliver oxygen & glucose
- numerous mitochondria to provide ATP
- Fast-twitch fibres
- Contract more rapidly
- Produce powerful contractions but only for a short period
- Adapted to intense exercise, ie weight-lifting
- Common in muscles such as biceps
- Adaptations of F-T-F
- thicker & more numerous myosin filaments
- high conc of enzymes involved in anaerobic exercise
- store of phosph-creatine
- rapidly generate ATP from ADP in anaerobic conditions
- provide energy for muscle contraction
- rapidly generate ATP from ADP in anaerobic conditions
- Slow-twitch fibres
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