Endogenous opioids such as endorphins:
A) excite neural pathways.
B) contribute to analgesia.
C) cause muscle spasms.
D) release neurotensin.
Ans: B
Feedback:
The opioid receptors, important for the inhibition of pain perception, are sites where endogenous opioids and exogenous opioids bind. Three groups of endogenous opioids relieve pain: enkephalins, endorphins, and dynorphins.
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