Why are slow-twitch muscles more beneficial than fast-twitch muscles for cardiorespiratory fitness?

Slow-twitch muscle fibers rely on aerobic energy production, which uses oxygen to keep muscles working over long periods. They use oxygen more efficiently than fast-twitch fibers, so they support endurance and cardiorespiratory fitness. The correct choice is D, “Slow-twitch muscles are able to use oxygen more efficiently than fast-twitch muscles.”

AI-written and checked against the verified answer.