MedlinePlus will direct you to information to help answer health questions. MedlinePlus has extensive information about drugs, an illustrated medical encyclopedia, interactive patient tutorials, and latest health news.
Using animated graphics, each tutorial explains a procedure or condition in easy-to-read language. You can also listen to the tutorial. Formats are interactive tutorial, self-running tutorial and text summary (PDF).
Check out out: http://www.nlm.nih.gov/medlineplus/tutorial.html