Chapter 2: Muscle fiber types

Question 1

Type I (slow twitch)

Answer 1

These are also known as endurance fibers. They are smaller, produce less power, receive more oxygen and are more mitochondrial dense

Question 2

Type II (fast twitch)

Answer 2

These do not have as much endurance, have less oxygen delivery, have short-term contractions, can produce more force and power and are larger than type I fibers

Question 3

Type IIx

Answer 3

These have a low oxidative capacity and or quick to fatigue.

Question 4

Type IIa

Answer 4

These have a higher oxidative capacity and will fatigue slower than type IIx. Another name for these is intermediate fast twitch muscle fibers.