Natural analgesia occurs when
a. endogenous opiates bind to P-substance
b. endogenous opiates bind to nociceptors in the spinal cord
c. the periaquaductal gray matter stimulates afferent pain fibers in the spinal cord
d. endogenous opiates bind to excitatory interneurons in the dorsal horns
e. periaquaductal gray matter causes interneurons to release endogenous opiates that bind to receptors on afferent pain fibers
E
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