PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They contain large amounts of Mitochondria
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They are fast to fatigue
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They are recruited last
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Generally they are larger muscles
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Detailed explanation-1: -Slow-twitch muscle fibers are fatigue resistant, and focused on sustained, smaller movements and postural control. They contain more mitochondria and myoglobin, and are aerobic in nature compared to fast-twitch fibers.
Detailed explanation-2: -Type I muscle fibers, or slow-twitch muscle fibers, are red in color and contain high concentrations of mitochondria. Type II muscle fibers, or fast-twitch muscle fibers, are white in color and have low concentrations of mitochondria.
Detailed explanation-3: -Type I Slow Twitch Oxidative Slow oxidative fibres contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. They produce low power contractions over long periods and are slow to fatigue. High aerobic capacity, efficient at working isometrically.
Detailed explanation-4: -The fiber types I and IIA have elongated mitochondria and higher rates of mitochondrial fusion compared to glycolytic muscle fibers.