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.

Explanation:

Slow - twitch muscles are aerobic and use oxygen efficiently for sustained activity, which is beneficial for cardiorespiratory fitness. They are not longer and thicker than fast - twitch muscles in a way that directly relates to cardiorespiratory benefit. They don't necessarily need less blood to contract, and they don't need more recovery time.

Answer:

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