Opioid drugs exert their effects on afferent pain pathways by binding to neuronal receptors that in turn
A) decrease transmitter release from presynaptic terminals
B) decrease excitability (hyperpolarize) postsynaptic neurons
C) decrease production of endogenous chemicals known as catecholamines
D) all the above are true
E) A and B only are true
Correct Answer:
Verified
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