Estrella Mountain Community College
Online Biology Book: Atp and Biological Energy
Through full-color images and concise information, learn about adenosine triphosphate, or ATP, the molecular unit of energy currency of cells.
Khan Academy
Khan Academy: Oxidative Phosphorylation
Article presents an in-depth overview of oxidative phosphorylation which provides most of the ready chemical energy (ATP) used by the cells in your body.
Other
Dr. Saul: Biology in Motion
This interactive site provides animations and activities in several areas of physiology. The images are simple, but clear. The accompanying text provides a good description of the process being shown.