Basic Pharmacology, Second Edition, similar to the first edition, talks about the relationship between the human body and therapeutic drugs. A large part of this book discusses the nervous system and the way certain drugs operate and affect it. The first part of this book covers the importance of having a firm understanding of the organ system, especially the nervous system. Understanding the systems is the initial step in learning how a drug affects the body, both internally and externally. This book also clarifies that a drug's impact occurs when it comes in contact with a chemical component of the body (enzymes, hormones, membranes, etc.). The next sections of this book discuss miscellaneous topics of the human anatomy, such as the brain, eyes, lungs, and various muscles. This edition also explains how a drug acts on each of those body parts. This book serves as a great reference to students affiliated in the anatomy, biology, pharmacy, and related fields.