8. The structure that is wrapped around actin at rest, but which moves out of the way for actin and myosin to bind during muscle contraction is:
a. T tubules
b. troponin
c. tropomyosin
d. all of the above

9. The thin filament is:
a. actin
b. myosin
c. acetylcholine
d. none of the above

10. The component that has globular heads for binding of the thin filaments for muscular contraction is:
a. actin
b. myosin
c. acetylcholine
d. none of the above

11. The major neurotransmitter at the neuromuscular junction is:
a. epinephrine
b. norepinephrine
c. dopamine
d. acetylcholine

12. Compared to skeletal muscle, smooth muscle:
a. contracts more slowly and relaxes more slowly
b. contracts more slowly and relaxes more rapidly
c. contracts more rapidly and relaxes more slowly
d. contracts more rapidly and relaxes more rapidly

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