This website gives a great introduction to the Endocrine System works. You are then able to navigate throughout the site by clicking the different glands shown in the beginning , or the pictures link which shows which parts of the body work in the system. Really good website to find cetain details about specific glands.

This video is a old cartoon explaining the digestive system. Really nice overview.

http://www.youtube.com/watch?v=M4e6qf8r8Tk&feature=related (part 2) http://www.youtube.com/watch?v=QY5q4GJOOgg&feature=related (part 3)

This website has a really good overview on how exactly the kidney works in the Excretory System. It gives you videos on what the kidney looks like as well.