Type 1
Type 2A
Type 2B
100
Give two characteristics of the slow twitch fiber
Uses oxygen for fuel
Provides continuous energy
Offers extended muscle contraction
Fires slowly
High endurance
100
Give another name for Type 2A fibres.
“Fast twitch oxidative”, or “Intermediate muscle fibres”.
100
Which type of respiration do type 2B fibres rely on?
Anaerobic respiration.
200
Label the slow twitch fibre on the diagram
200
What activity type turns Type 2B fibres to type 2A?
Resistance training.
200
Why do Type 2B fibres have few capillaries?
Because they do not require oxygenation, they rely on anaerobic respiration.
300
Why is the slow muscle fibre also called the red fibre?
It's because of the rich blood supply and the high concentration of mitochondria and myoglobin.
300
True or False? Type 2A fibres fatigue faster than Type 2B fibres.
FALSE. Type 2A fibres fatigue SLOWER than Type 2B fibres.
300
What are some ways of training type 2B fibres?
Jump squats, weight lifting, sprinting.
400
Aging causes a loss in lean muscle mass, what happens to the slow twitch fibre?
Increase in slow twitch fibre because muscle atrophy begins which causes a reduction in fast twitch fibres.
400
Are Type 2A fibres rich or poor in mitochondria & myoglobin?
They are RICH in both mitochondria and myoglobin.
400
Why do Type 2B fibres fatigue the quickest?
Because they have a low concentration of mitochondria.
500
Give an analogy other than a marathon runner for the slow twitch fibre and how is the slow twitch fiber used?
Anything that requires long distance: rowers, cyclists, cross country skiiers
500
What is/are the energy source(s) of Type 2A fibres?
BOTH carbohydrates and fats (since Type 2A can use aerobic AND anaerobic respiration).
500
Why do type 2B fibres have high myosin ATPase levels?
In order to achieve maximum contraction quickly.