What is a characteristic of a type II muscle fiber?

Type II muscle fibers, also known as fast-twitch fibers, are characterized by their ability to generate rapid and powerful contractions. These fibers are particularly effective for short bursts of activity, such as sprinting or heavy lifting, where immediate energy is required. They rely primarily on anaerobic metabolism, which allows them to contract quickly but fatigue faster as well.

This characteristic aligns with the nature of type II fibers being suited for explosive, short-duration efforts, making them ideal for activities that demand strength and speed over endurance. Unlike type I fibers, which excel in endurance and sustained activities due to their aerobic capacity, type II fibers focus on short-term power and performance.