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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Uses aerobic respiration and switch to anaerobic respiration.
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Primarily uses aerobic respiration to produce ATP.
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Primarily uses anaerobic glycolysis
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None of the above
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Detailed explanation-1: -Slow oxidative (SO) fibers contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. 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.
Detailed explanation-2: -The ATP required for slow-twitch fiber contraction is generated through aerobic respiration (glycolysis and Krebs cycle), whereby 30 molecules of ATP are produced from each glucose molecule in the presence of oxygen.
Detailed explanation-3: -Endurance exercise causes an increase in cellular mitochondria, myoglobin, and capillary networks in slow oxidative fibers. Endurance athletes benefit from a high proportion of slow oxidative fiber types relative to the other fiber types.