A regular heroin user,Johnny will become very sick if he goes a half day without using.This BEST illustrates:
A)drug tolerance.
B)physical dependence.
C)psychological dependence.
D)the role of expectancy effects.

Question

Quizplus · Accepted Answer

Physical dependence refers to the adaptive changes that take place in the body due to regular drug use. This can result in withdrawal symptoms when the drug is no longer taken, as is the case with Johnny who becomes very sick if he goes a half day without using heroin.

A Regular Heroin User,Johnny Will Become Very Sick If He