Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 16

All opiates produce three primary effects: a reduction in pain, which is called (a) _____; a twilight state between waking and sleeping, which is called (b) _____; and (c) _____, which permits their use as a treatment for diarrhea. With continued use of opiates, users develop tolerance, addiction, and an intense craving for the drug. The brain also produces its own morphinelike chemicals, called 1 (d) _____.