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HMS, TIP EQ-Bank 252

Outline the main characteristics that distinguish slow twitch muscle fibres from fast twitch muscle fibres in terms of their structure and function.   (3 marks)

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  • Slow twitch fibres contract slowly and sustain activity for extended periods without fatigue.
  • They are efficient at using oxygen to generate energy through aerobic metabolism pathways.
  • Slow twitch fibres contain high numbers of mitochondria and increased myoglobin content for oxygen storage.
  • Fast twitch fibres contract quickly and generate high power output but fatigue rapidly.
  • They rely primarily on anaerobic energy systems for fuel during explosive movements.
  • Fast twitch fibres have lower mitochondrial density but greater glycolytic enzyme activity for rapid energy production.
Show Worked Solution
  • Slow twitch fibres contract slowly and sustain activity for extended periods without fatigue.
  • They are efficient at using oxygen to generate energy through aerobic metabolism pathways.
  • Slow twitch fibres contain high numbers of mitochondria and increased myoglobin content for oxygen storage.
  • Fast twitch fibres contract quickly and generate high power output but fatigue rapidly.
  • They rely primarily on anaerobic energy systems for fuel during explosive movements.
  • Fast twitch fibres have lower mitochondrial density but greater glycolytic enzyme activity for rapid energy production.

Filed Under: Physiological adaptations and improved performance Tagged With: Band 2, smc-5461-30-Muscular adaptations

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