In the central nervous system, the classic hallucinogens act as
a. 5-HT2 receptor agonists.
b. 5-HT2 receptor antagonists.
c. 5-HT3 receptor agonists.
d. 5-HT3 receptor antagonists.
e. 5-HT1 receptor antagonists.
Answer: A
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The study of population numbers is called
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