First, a look into the components of blood:
Flow of blood through capillaries:
A white blood cell chasing a bacterium:
A 3D model of the heart that can be virtually dissected:
http://thevirtualheart.org/anatomyindex.html
The operation of the heart:
And finally, an overview of the digestive system in case you forgot:
Valve operation: (http://www.arthursclipart.org/medical/circulatory/valves%20in%20vein%203.gif)
A video of the valves in action:
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