Marathon runners are long-distance runners (marathons are races that are 26.2 miles long). Studies have shown that the muscles of marathon runners contain an abundance of slow-twitch muscle cells. Which of the following statements about these fibers is

true?

A) Slow-twitch fibers have lots of mitochondria to make ATP aerobically.
B) Slow-twitch fibers have lots of mitochondria to make ATP through fermentation.
C) Slow-twitch fibers have few mitochondria and make ATP aerobically.
D) Slow-twitch fibers have few mitochondria and make ATP through fermentation.


Answer: A

Biology & Microbiology

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