NATS 1575 Midterm: Chapter 5

• School: York University
• Department: Natural Science
• Course: NATS 1575
• Professor: Rajeshwari Iyer

Document Summary

A drug can be defined as a natural or synthetic substance that is used to produce physiological or psychological effects in humans or other higher order animals. Psychological dependence stems from conditioned use of a drug caused by emotional needs. Physical dependence is a physiological stem from conditioned use of a drug caused by emotional needs. Physical dependence is a physiological need for a drug brought about by regular administration abruptly stops. The common denominator that characterizes all types of repeated drug use is the creation of psychological dependence for continued use of the drug. The desire to avoid withdrawal sickness ultimately causes physical dependence or addiction. Marijuana and cocaine are common drugs of abuse whose regular use does not lead to physical dependence. The regular use of a narcotic drug will invariably lead to physical dependence. The most common source for these narcotic drugs is opium, extracted from poppies.