Natural Analgesia Occurs When

Multiple Choice

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.