Natural analgesia occurs when:
A) Endogenous opiates bind to P-substance.
B) Endogenous opiates bind to receptors on afferent pain fibers.
C) The periaquaductal gray matter is stimulated.
D) Endogenous opiates bind to P-substance and to receptors on afferent pain fibers.
E) Endogenous opiates bind to receptors on afferent pain fibers and the periaquaductal gray matter is stimulated.
Correct Answer:
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