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Unformatted text preview: 4. Botox injections smooth facial wrinkles because botulin is a(n): a. ACh antagonist. b. dopamine antagonist. c. ACh agonist. d. dopamine agonist. 5. In stressful situations, the sympathetic nervous system ________ blood sugar levels and ________ the pupils of the eyes. a. lowers; dilates b. raises; contracts c. lowers; contracts d. raises; dilates 6. The endocrine system consists of: a. dendrites. b. neural networks. c. interneurons. d. glands. 7. Which of the following chemical messengers is both a neurotransmitter and a hormone? a. serotonin b. acetylcholine c. norepinephrine d. dopamine...
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- Winter '08