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)

--- 9 WORK AREA LINES (style=lined) ---

Show Answers Only

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.