Question

which statement best describes the factors that affect muscular endurance?
a. size of the muscle cells, ability to store fuel, and blood supply to the muscles
b. number of muscles, amount of exercise, and type of person
c. level of flexibility, amount of exercise, and ability to store fuel
d. blood supply to the muscle, type of exercise, and type of muscle cells

Explanation:

Muscular endurance is related to how long muscles can perform. Muscle cell size affects strength - endurance relation. Fuel storage (like glycogen) is needed for sustained activity. Blood supply delivers oxygen (for aerobic energy production). Option B's "type of person" is too vague. Option C's "flexibility" is a different fitness component. Option D misses fuel storage.

Answer:

A. size of the muscle cells, ability to store fuel, and blood supply to the muscles