PHYSIOLOGY
DIFFERENT TYPE AND STRUCTURE OF MUSCLE FIBERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primarily uses anaerobic glycolysis
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Primarily uses aerobic respiration to produce ATP
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Uses aerobic respiration and switch to anaerobic respiration.
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None of the above
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Detailed explanation-1: -Fast oxidative (FO) fibers have fast contractions and primarily use aerobic respiration, but because they may switch to anaerobic respiration (glycolysis), can fatigue more quickly than SO fibers. Lastly, fast glycolytic (FG) fibers have fast contractions and primarily use anaerobic glycolysis.
Detailed explanation-2: -Fast oxidative muscles, also known as type II-A fast twitch also use aerobic respiration and contain a high amount of oxygen, myoglobin and mitochondria, but they break down ATP quickly and therefore contract quickly.
Detailed explanation-3: -Resistance exercise leads to muscle hypertrophy, primarily targeting fast glycolytic fibers. Power-producing muscles have a higher density of fast glycolytic fibers than of slow oxidative fibers.