Blood Pressure Video

http://videos.howstuffworks.com/hsw/16822-the-circulatory-system-blood-pressure-video.htm

Short and sweet...gives the basics.

Arteries and Veins

Simple videos on arteries and veins.
http://www.youtube.com/watch?v=I93ricIIOms

http://videos.howstuffworks.com/hsw/17092-the-circulatory-system-the-blood-vessels-video.htm

Conduction Systems of the Heart

A descriptive video on the conducting systems of the heart. It goes through the SA node and the AV node etc...
http://www.youtube.com/watch?v=wpHHc1BiOxs

Heart Attack Causes

A short video on the causes of a heart attack.

http://www.youtube.com/watch?v=LA2DuxCcO4g

Circulation and the Heart

The link below should lead you to a simple, but great illustration of the heart and circulation.
http://www.youtube.com/watch?v=D3ZDJgFDdk0