PSYC62H3 Chapter Notes - Chapter 3: Area Postrema, Metabolic Pathway, Menopause
Document Summary
Additional barriers in the circulatory system & metabolic enzymes in the liver. Barrier can provide significant resistance to the entry of drugs & other substances in the brain & subtle i. e. scopolamine & atropine readily penetrate into the brain to produce therapeutic effects but two close. Originally referred to any substance used in chemistry or medical practice. Gradually restricted to any agent used in medicine or any ingredient in medicines. Today used as synonym for a narcotic agent or illicit substance. In general its" a chemical that affects one or more biological processes but not all chemicals that affect biological processes = drugs i. e. salt, water, proteins, fats, carbs, vitamins & minerals st. Endogenous substances- chemicals originating or produces within an organism that are used to carry out normal biological functions in the body aren"t usually though as drugs opposed to drugs which are exogenous. Drug: non-food, nonmechanical substance (usually chemical substance) that exerts an effect upon a living system.
