Section 4

• Psychoactive drugs affect the CNS. Dependence is a physical or psychological need for a drug. Tolerance is a characteristic of addiction in which larger and larger amounts of the drug are needed.

Drugs and the Nervous System

• Drug addiction involves physiological changes in neurons.

• Alcohol is an addictive depressant that widely affects the CNS. Nicotine is an addictive stimulant found in tobacco products.

Vocabulary drug (p. 1021)

psychoactive drug (p. 1021) dependence (p. 1021) addiction (p. 1021)

tolerance (p. 1G21) withdrawal (p. 1G21) stimulant (p. 1G22)

depressant (p. 1G23) blood alcohol concentration (p. 1G23)

nicotine (p. 1G24) emphysema (p. 1G24)

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