QuestionSBA
QuestionChoice
This is incorrect. Type I muscle fibres primarily rely on aerobic (oxidative) energy production, not anaerobic energy production.
10026078
d
Anaerobic energy production
QuestionChoice
This is correct. Type I muscle fibres have a high fatigue resistance and are capable of sustaining contractions for extended periods.
10026075
a
High resistance to fatigue
QuestionChoice
This is incorrect. Type I muscle fibres tend to have a smaller cross-sectional area compared to type II (fast-twitch) muscle fibres, as they are adapted for endurance rather than force production.
10026079
e
Large cross-sectional area
QuestionChoice
This is incorrect. Type I muscle fibres have a relatively high myoglobin content, providing oxygen delivery and thus supporting their aerobic metabolism.
10026077
c
Low myoglobin content
QuestionChoice
This is incorrect. Fast contraction speed is not a characteristic of type I muscle fibres. Type I fibers are known for their slow contraction speed, but high fatigue resistance.
10026076
b
Fast contraction speed
Concept
Chapter
2693
5875
Muscle physiology
Topic
311
Bone physiology
17613
A 27 year old woman consults her GP about persistent muscle pain and fatigue. She has recently begun training for a marathon and is adhering to a strict exercise schedule. She is keen to learn more about the way her muscles work.

Which of the following is a characteristic of type I muscle fibres?
a