Evidence for the existence of a descending pain-control circuit came from the finding that
A) stimulation of the PAG produces analgesia.
B) the PAG contains opiate receptors.
C) some opiates are endogenous.
D) all of the above
E) none of the above

Question

Quizplus · Accepted Answer

All three statements are true and provide evidence for the existence of a descending pain-control circuit. Stimulation of the PAG produces analgesia, the PAG contains opiate receptors, and some opiates are endogenous (produced by the body). Together, these findings suggest that there is a neural circuit that regulates pain perception and that opiates may act on this circuit to reduce pain.

Evidence for the Existence of a Descending Pain-Control Circuit Came