Which statement best differentiates Type I and Type II muscle fibers in terms of fatigue resistance, mitochondria, and color?

Which statement best differentiates Type I and Type II muscle fibers in terms of fatigue resistance, mitochondria, and color?

• A. Type I are fast-twitch, glycolytic fibers with few mitochondria and pale color.
• B. Type II are slow-twitch, highly oxidative fibers with many mitochondria.
• C. Type I are slow-twitch, highly oxidative with many mitochondria and capillaries, red in color and fatigue-resistant; Type II are fast-twitch, more glycolytic with fewer mitochondria, paler, and fatigue more quickly.
• D. Type II are always more fatigue-resistant than Type I.

Answer: (C)