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Which of the following processes usually results in muscle fatigue?


A) Using muscles increases the breakdown of acetylcholinesterase.
B) Muscle fiber sodium channels become "leaky" during prolonged use.
C) Internal organelles responsible for picking up calcium develop "leaky channels" as muscles are used.
D) Actin and myosin molecules break due to overuse.

E) None of the above
F) A) and C)

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Ia sensory fibers are activated in response to


A) contraction of muscle fibers.
B) stretching of Golgi tendon organs.
C) stretching of muscle spindles.
D) input from Ib fibers.

E) A) and B)
F) A) and C)

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