Which of the following is NOT characteristic of slow- twitch muscle fibers?
A)pale color
B)many mitochondria
C)form ATP only by aerobic respiration
D)operate during marathon runs
E)found in abundance in migrating ducks

Question

Quizplus · Accepted Answer

Slow-twitch muscle fibers, also known as type I fibers, are known to be dark in color due to the high concentrations of myoglobin and contain vast numbers of mitochondria. They contract relatively slowly and generate less force than fast-twitch fibers, but they are able to sustain contractions for extended periods of time without fatigue due to their ability to generate ATP solely through aerobic respiration. Slow-twitch fibers are typically utilized during endurance activities such as long-distance running or cycling. While slow-twitch fibers are found in abundance in the muscles of migrating birds such as ducks, they are not typically described as pale in color.

Which of the Following Is NOT Characteristic of Slow- Twitch