A slow-twitch muscle fiber

Question

Quizplus · Accepted Answer

Slow-twitch muscle fibers have a high concentration of capillaries, which allow for increased oxygen delivery to sustain aerobic metabolism during prolonged contractions.

Answer: D 
 Slow-twitch muscle fibers rely primarily on aerobic metabolism, which is supported by the many mitochondria present in these cells.

Answer: E 
 Slow-twitch muscle fibers use ATP slowly and sustain contractions over a long period of time due to their high oxidative capacity (aerobic metabolism). They are also high in capillary density and low in myoglobin content, which helps support sustained aerobic metabolism.

A Slow-Twitch Muscle Fiber