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Subunits of skeletal muscle cells that are composed of sarcomeres are called


A) myofibrils.
B) myofilaments.
C) sarcolemmas.
D) transverse tubules.

E) All of the above
F) A) and B)

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The arrector pili muscles and ciliary muscles are multi-unit smooth muscles.

A) True
B) False

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A crossed-extensor reflex demonstrates double reciprocal innervation.

A) True
B) False

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A reserve of high energy phosphate is stored in muscle as


A) phosphocreatine.
B) adenosine triphosphate.
C) glucose 6-phosphate.
D) creatine kinase.

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

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What condition of smooth muscle allows it to maintain contraction for long periods of time?


A) latch state
B) gap junctions
C) peristalsis
D) myogenic activity

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

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Fast twitch fibers have the greatest resistance to fatigue.

A) True
B) False

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Somatic motor neurons release the neurotransmitter _________ at the neuromuscular junction.


A) dopamine
B) acetylcholine
C) norepinephrine
D) serotonin

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

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