For a drug index, I suggest visiting:
http://www.rxlist.com/script/main/hp/asp.
For general information on how systems work, I find Wikipedia helpful.
http://www.wikipedia.org
An online medical dictionary I use is:
http://cancerweb.ncl.ac.uk/cgi-bin/omd?action=Home&query=
Another online medical dictionary I use is:
http://medicinenet.com/script/main/art.asp?articlekey=54842
May I also suggest looking at the Canada Food Guide:
http://www.hc-sc.gc.ca/fn-an/food-guide-aliment/index_e.html
Learn about the flu.
Learn about the common cold.
Learn about how x-rays work.
Learn about nearsightedness vs. farsightedness.
Learn about the spine.
Learn about allergies.
Learn about how MRI's work.
Learn about migranes.
Learn about in vitro fertilization.
Learn about the human heart.
Learn about heart attacks.
Learn about bone fractures.
Learn about frostbite.
Learn about drug addictions.
For videos on more medical items, visit http://video.about.com/health.htm.