SECTION 29.5 BRAIN FUNCTION AND CHEMISTRY Power Notes Technology Details Normal CHAPTER 29 Nervous and Endocrine Systems What alters brain chemistry? Addiction is: Copyright by McDougal Littell, a division of Houghton Mifflin Company Desensitized Tolerance is: Two types of drugs are: Stimulants: Sensitized Depressants: Unit 9 Resource Book McDougal Littell Biology Power Notes 41