PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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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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They contain low numbers of Mitochondria
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Detailed explanation-1: -Fast twitch fibers, or type II fibers, have fewer mitochondrion and myoglobin proteins than slow twitch fibers (2).
Detailed explanation-2: -The fiber types I and IIA have elongated mitochondria and higher rates of mitochondrial fusion compared to glycolytic muscle fibers. Therefore, the level of mitochondrial fusion correlates with the OXPHOS capacity of the fiber.
Detailed explanation-3: -Skeletal muscles are made of long, thin cells that are packed with highly organized proteins and organelles. During strenuous exercise, the rate of energy use in skeletal muscles can increase by more than 100-fold almost instantly. To meet this energy demand, muscle cells contain mitochondria.
Detailed explanation-4: -Because they do not primarily use aerobic metabolism, they do not possess substantial numbers of mitochondria or significant amounts of myoglobin and therefore have a white color.