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Latest revision as of 02:34, 25 September 2026
Which of the following best identifies the site of action of mu-opioid receptors in the central nervous system?
a) Inhibition of neurotransmitter release at the neuromuscular junction
b) Inhibition of neurotransmitter release at the presynaptic terminal
c) Stimulation of neurotransmitter release at the postsynaptic terminal
d) Increased conduction speed in the corticospinal tract
e) Enhanced perception in the thalamus
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Answer
Answer b. Opioid receptors (mu, kappa, and delta) all produce analgesia primarily by inhibiting synaptic transmission in the CNS and in the myenteric plexus via their location on the presynaptic terminal.
Notes
- This question originally printed in the Pediatric Anesthesiology Review Topics kindle book series, and appears courtesy of Naerthwyn Press, LLC.