Question

In which of the following functions, white muscles are not required or used?

• A. Moving of eyeballs
• B. Fast and strenuous work for short duration.
• C. Fast flight as in sparrows
• D. For sustained work at a slow rate for a long duration

Answer 1

The correct option is D

For sustained work at a slow rate for a long duration

Red muscles are for endurance.depend on aerobic metabolism for energy (oxidative phosphorylation). Mitochondria and Myoglobin are abundant and no accumulation of lactic acid.

White muscles depend on anaerobic metabolism for energy(glycolysis).Lactic acid accumulation due to glycolysis.Mitochondria is less and they perform fast and strenuous work for a short period(fast work but soon fatigue sets in).