twitch fibres

Question 1

slow twitch muscle fibres

Answer 1

• adapted for aerobic respiration
• suited to low intensity but long duration exercise
• slow contractile speed
• high fatigue resistance
• low strength
• generate ATP aerobically

Question 2

adaptations of slow twitch fibres

Answer 2

• small diameter
• many mitochondria
• lots of myoglobin
• few glycogen
• many capillaries

Question 3

fast twitch muscle fibres

Answer 3

• adapted for anaerobic respiration
  -suited to high intensity and short duration exercise
• fast contractile speed
• low fatigue resistance
• high strength
• generate ATP anaerobically

Question 4

adaptions of fast twitch muscle fibres

Answer 4

• large diameter
• few mitochondria
• little myoglobin
• many glycogen granules
• few capillaries
• large stores of creatine phosphate