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

please select the best answer from the choices provided.

○ a
○ b
○ c
○ d

Explanation:

To determine the best answer, we analyze each option:

• Option A: Muscle cell size (affects capacity), fuel storage (e.g., glycogen for energy), and blood supply (delivers oxygen/fuel) are key factors for muscular endurance.
• Option B: "Number of muscles" and "type of person" are not primary factors affecting muscular endurance.
• Option C: Flexibility is related to range of motion, not directly to muscular endurance.
• Option D: "Type of exercise" is more about training specificity, while muscle cell type (e.g., slow - twitch vs fast - twitch) is part of muscle physiology, but the combination in D is less accurate than A.

So, the factors in A are the most relevant to muscular endurance.

Answer:

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