Just click on the given below links You will learn about the Urinary System Or Excretory system in Human (Animation)
http://www.dnatube.com/video/28208/Urinary-system–The-nephron-Animation
http://www.dailymotion.com/video/x1efu98_learn-biology-human-excretory-system-youtube-1_shortfilms
http://www.sumanasinc.com/webcontent/animations/content/kidney.html
Muhammad Tahsin 