Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?
A) gym climbing
B) a long, relaxing swim
C) playing baseball or basketball
D) a sprint by an Olympic runner

Question

Quizplus · Accepted Answer

Red muscle fibers, also known as slow-twitch fibers, are more efficient at using oxygen to generate more fuel for continuous, extended muscle contractions over a long time. They are best suited for endurance activities like a long, relaxing swim.

Three Discrete Types of Muscle Fibers Are Identified on the Basis