Marathon runners tend to have a high percentage of ____ in their leg muscles.
A) slow, red fibers
B) slow, white fibers
C) fast, red fibers
D) fast, white fibers
E) both red and white fibers

Question

​Marathon runners tend to have a high percentage of ____ in their leg muscles.
A) ​slow, red fibers
B) slow, white fibers
C) ​fast, red fibers
D) ​fast, white fibers
E) ​both red and white fibers

Quizplus · Accepted Answer

Marathon runners tend to have a high percentage of slow, red fibers in their leg muscles. These fibers are more efficient at using oxygen to generate fuel for continuous, extended muscle contractions over a long time, which is ideal for endurance sports like marathons.

​Marathon Runners Tend to Have a High Percentage of ____

Marathon Runners Tend to Have a High Percentage of ____