Question

What do type 1 muscle fibers primarily use for fuel? What size are they usually? Example of where it would be located? Type of athlete?

a) Use carbohydrates for fuel, smaller in size, found in endurance athletes
b) Use fat for fuel, larger in size, found in sprinters
c) Use protein for fuel, moderate size, found in bodybuilders
d) Use glucose for fuel, very large in size, found in powerlifters

Answer 1

Type 1 muscle fibers primarily use aerobic metabolism and carbohydrates as fuel. They are smaller in size and are found in endurance athletes.

Step-by-step explanation:

Type 1 muscle fibers primarily use aerobic metabolism to produce low power contractions over long periods and are slow to fatigue. They mainly rely on carbohydrates as fuel. These fibers are usually smaller in size and are found in endurance athletes, such as marathon runners.