Question

why are slow-twitch muscles more beneficial than fast-twitch muscles for cardiorespiratory fitness?
a. slow-twitch muscles are longer and thicker than fast-twitch muscles.
b. slow-twitch muscles need less blood to contract than fast-twitch muscles.
c. slow-twitch muscles need more recovery time between exercise sessions than fast-twitch muscles.
d. slow-twitch muscles are able to use oxygen more efficiently than fast-twitch muscles.

please select the best answer from the choices provided.

○ a
○ b
○ c
○ d

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Slow - twitch muscles are not necessarily longer and thicker than fast - twitch muscles. This statement is incorrect.
• Option B: Slow - twitch muscles actually require a good blood supply (more blood, not less) to sustain aerobic activity. So this option is wrong.
• Option C: Fast - twitch muscles typically need more recovery time than slow - twitch muscles. So this option is incorrect.
• Option D: Slow - twitch muscles are designed for aerobic activities and are more efficient at using oxygen, which is crucial for cardiorespiratory fitness as it involves the efficient use of oxygen during sustained exercise. This statement is correct.

Answer:

D. Slow - twitch muscles are able to use oxygen more efficiently than fast - twitch muscles.