Rice University
Biology for AP® Courses
An eight-unit electronic textbook provides a guide to AP® Biology. Each of the 28 chapters include an introduction, multiple lessons, a summary, review questions, and test prep questions. Teachers see how each lesson connects to a big...
Colorado State University
Colorado State University: Basic Functional Anatomy of the Digestive System
This site has a concise description of the digestive system with a nice diagram. The site also provides basic definitions of key parts.