Which of the following are not endorphins?
A. Dynorphins
B. -Endorphins
C. Enkephalins
D. All of the above are types of endorphins.
ANS: D
Rationale: Antinociception is the suppression of pain in response to stimulation that would normally be painful. The endogenous or natural-occurring substances that activate antinociceptive mechanisms are called endorphins. Endorphins include enkephalins, dynorphins, and -endorphins.
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