The proportion of fast and slow-twitch fibers found in an individual's quadriceps muscle is primarily determined by the
A) individual's diet.
B) number of hours the individual spends each week engaged in anaerobic activity,like weightlifting.
C) individual's genetics.
D) number of hours the individual spends each week engaged in aerobic activity,like running or cycling.

Question

Quizplus · Accepted Answer

The proportion of fast and slow-twitch fibers is determined by genetics, not by an individual's diet or exercise habits. While exercise can influence muscle composition to some extent, it does not override the genetic factors that determine fiber type distribution.

The Proportion of Fast and Slow-Twitch Fibers Found in an Individual's