Describe TWO characteristics and functions of fast twitch muscle fibres. (3 marks)
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Sample Answer – ANY 2 of the following
- Fewer mitochondria: Contains limited mitochondria compared to slow-twitch fibres. Relies on anaerobic energy production rather than oxygen-dependent pathways.
- Rapid contraction: Contracts quickly to generate explosive force. Enables powerful movements but for short durations only.
- Quick fatigue: Depletes energy rapidly due to anaerobic metabolism. Limits sustained activity to approximately 10 seconds of maximum effort.
- Larger diameter: Fast-twitch fibres are larger than slow-twitch fibres. Greater size enables more forceful contractions for explosive movements like jumping and sprinting.
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Sample Answer
- Fewer mitochondria: Contains limited mitochondria compared to slow-twitch fibres. Relies on anaerobic energy production rather than oxygen-dependent pathways.
- Rapid contraction: Contracts quickly to generate explosive force. Enables powerful movements but for short durations only.
- Quick fatigue: Depletes energy rapidly due to anaerobic metabolism. Limits sustained activity to approximately 10 seconds of maximum effort.
- Larger diameter: Fast-twitch fibres are larger than slow-twitch fibres. Greater size enables more forceful contractions for explosive movements like jumping and sprinting.