During activities requiring aerobic endurance
glycogen and glycolysis are the primary sources of reserve energy.
fatigue occurs in a few minutes.
most of the muscle’s energy is produced in mitochondria.
oxygen debts are common.
oxygen is not required.
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The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
anaerobic
fast
high-density
intermediate
slow
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Which of these is not a property of slow muscle fibers?
They are rich in myoglobin.
They resist fatigue.
They contract slowly.
They are large in diameter.
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The __________ type of muscle fiber has relatively few mitochondria.
intermediate
slow
fast
cardiac
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