191) Which class of psychoactive drugs works by increasing activity within the nervous system? a. Opiates b. Psychedelics c. Depressants d. Stimulants 192) Tobacco is often used to a. appear more sophisticated. b. increase feelings of anxiety. c. enhance feelings of sexual pleasure. d. reduce feelings of anxiety. 193) The most powerful natural stimulant is a. tobacco. b. LSD. c. cocaine. d. marijuana. 194) If someone is experiencing difficulty sleeping, like with insomnia, he or she may go to a family doctor. What type of drug is the doctor most likely to prescribe to assist the person in falling asleep? a. Sedative-hypnotics b. Opiate-narcotics c. Stimulants d. Psychedelics 195) Nicotine activates receptors sensitive to the neurotransmitter __________________, and smokers report feelings of stimulation as well as relaxation and alertness. a. acetylcholine b. dopamine c. serotonin d. melatonin 196) What drug did Sigmund Freud use to treat morphine addiction? a. Cocaine b. Methamphetamine c. Heroin d. Mescaline 197) The physical effects of _____________ involve destroyed blood vessels, acne, weight loss, tremors, and dental problems. a. cocaine b. methamphetamine c. heroin d. mescaline 198) Which of the following people is least likely to become addicted to the opiate drugs he or she is using? a. Demetria, who uses heroin frequently to avoid the painful withdrawal symptoms. b. Trevor, who desires the extreme euphoria and high he gets when using OxyContin. c. Phyllis, who is using morphine to help control her pain levels after a recent surgery. d. Xavier, who is using them to forget about the problems in his social and work life. 199) What general category of drug is used in the controlling of pain? a. Depressants and sedative-hypnotics b. Psychedelics c. Opiate narcotics d. Stimulants 200) Symptoms like abdominal cramps, vomiting, drug cravings, yawning, runny nose, sweating, and chills are associated with _____________________. a. methamphetamine use. b. amotivational syndrome. c. heroin withdrawal syndrome. d. cocaine psychosis.