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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Which fibers are relatively fatigue-resistant and use aerobic respiration?
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oxidative
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glycolytic
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Type I fibers have low ATPase activity (at pH 9.4), are slow twitch, have high oxidative and low glycolytic capacity, and are relatively resistant to fatigue.
Detailed explanation-2: -Cardiac muscle tissue is composed of cardiac muscle cells (also known as cardiomyocytes). These cells use aerobic metabolism almost exclusively which makes the heart highly resistant to fatigue.
Detailed explanation-3: -Type 1 and 2A fibers primarily use oxidative metabolism, and type 2X and 2B fibers primarily rely upon glycolytic metabolism.
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