e. A and C - answer✔E. A and C (desensitization and down-regulation)
Drug that lacks intrinsic efficacy but retains affinity and competes with the agonist for the
binding site on the receptor - answer✔competitive antagonist
this type of drug produces its effect by binding a site on the receptor distinct from that of the
primary agonist and thereby changing the affinity of the receptor for the agonist - answer✔non-
competitive antagonist
In this type of study, participants are blinded to treatment assignment, but investigators are not. -
answer✔single blinded study
The neurotransmitter of all preganglionic autonomic fibers and all postganglionic
parasympathetic fibers - answer✔Acetylcholine
the release of acetylcholine and other neurotransmitters by exocytosis is inhibited by -
answer✔botulinum toxin
all of the ff enzymes are involved in the biosynthesis of epinephrine from tyrosine EXCEPT:
a. tyrosine hydroxylase
b. aromatic L-amino acid decarboxylase
c. dopamine Beta-hydroxylase
d. phenylethanolamine-N-methyl transferase
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