Question

which of the following types of muscle fibers is the most efficient at producing large amounts of atp?

a.) type 2a fiber
b.) slow oxidative fiber
c.) fast glycolytic (fg) fiber
d.) fast oxidative (fo) fiber

Explanation:

Identify the metabolic pathways of muscle fibers

Slow oxidative (SO) fibers rely primarily on aerobic respiration (oxidative phosphorylation) to produce ATP, which yields approximately 30 to 32 ATP molecules per glucose molecule. Fast glycolytic (FG) fibers rely on anaerobic glycolysis, yielding only 2 ATP molecules per glucose molecule.

Compare ATP production efficiency

Aerobic metabolism in slow oxidative fibers is highly efficient and produces large amounts of ATP over sustained periods, making these fibers highly resistant to fatigue compared to fast-twitch glycolytic or intermediate oxidative-glycolytic fibers.

Answer:

• a.) Type 2A fiber
• b.) Slow Oxidative Fiber (Correct answer)
• c.) Fast glycolytic (FG) Fiber
• d.) Fast Oxidative (FO) Fiber