Type IIx fibers
A) contain a high concentration of aerobic enzymes.
B) are very energy efficient.
C) have high specific tension.
D) exhibit a high level of fatigue resistance.

Question

Quizplus · Accepted Answer

Type IIx fibers are characterized by a high specific tension, meaning they are capable of generating a lot of force per unit of cross-sectional area. They are also known as fast-twitch glycolytic fibers and are designed for short bursts of high-intensity activity, such as sprinting or weightlifting. However, they are not very energy efficient and fatigue easily due to their reliance on anaerobic metabolism for energy. They also have a lower concentration of aerobic enzymes compared to type I and IIa fibers.

Type IIx Fibers