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jeddsn jeddsn
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6 years ago
Morphine, heroin, and codeine are effective because they imitate the action of our natural ____.
 
  a. excitatory neurotransmitters
  b. tryptamines
  c. endorphins
  d. catecholamines
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48hiam48hiam
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6 years ago
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jeddsn Author
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6 years ago
TY so very much
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