Which of the following statements about different kinds of skeletal muscle fibers is TRUE?
A) Slow-oxidative fibers have a greater abundance of glycogen than do fast-glycolytic fibers.
B) Fast-glycolytic fibers have a greater abundance of myoglobin than do slow-oxidative fibers.
C) A fast-glycolytic fiber can generate greater tension than a slow-oxidative fiber.
D) Fast-glycolytic fibers and slow-oxidative fibers are innervated by alpha motor neurons of the same diameter.
E) To generate ATP, fast-glycolytic fibers depend mainly on oxidative phosphorylation while slow-oxidative fibers depend mainly on glycolysis.

Question

Quizplus · Accepted Answer

A fast-glycolytic fiber can generate greater tension than a slow-oxidative fiber. This is because fast-glycolytic fibers have a larger diameter, more myofibrils, and a higher density of myosin cross-bridges than slow-oxidative fibers. Additionally, fast-glycolytic fibers have a lower oxidative capacity and thus rely more on anaerobic glycolysis to generate ATP quickly for high force generation. Therefore, they can generate greater tension but have a lower endurance than slow-oxidative fibers which rely more on aerobic metabolism.

Which of the Following Statements About Different Kinds of Skeletal