Blood vessels:veins
http://etveinclinic.com/FAQ.html 
The heart
See exactly how your heart pumps blood throughout your body and learn astounding facts about the human heart. Map of the Human Heart
A heart working. http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/ourselves/0_fit_for_life1.shtml
Homework:
By-pass heart surgery game: http://www.abc.net.au/science/lcs/heart.htm In this interactive you are a surgeon performing coronary bypass surgery, one of the most invasive of all medical procedures. Do you have what it takes to perform under pressure?
1. How many doctors and what type do you need for the surgery?
2. Briefly describe each step of the surgery.
Another game
http://www.paisdelosjuegos.es/juego/m%C3%A9dicos/heart+surgery.html
