Muscular+System

http://yucky.discovery.com/flash/body/pg000123.html

It shows a good way of understanding why u need muscles and how many muscles u have

http://www.innerbody.com/image/musfov.html

This website shows all the different muscles and more.

It also shows a really good picture.

http://www.ehow.com/about_5370583_function-muscular-system.html

it shows agreat way about the function of the system