Blood - the medium in which the body gets its energy, oxygen, and nutrients, it is a deep red color.
Blood vessels: arteries - transports oxygen rich blood (color of red) to the different areas of the body for use.
Blood vessels: veins - transports oxygen poor blood (color of blue) back to the heart where it goes to the lungs to be re-oxygenated and used again.
Blood vessels: capillaries - places of exchange of fluids and solutes with the interstitial fluid.
Heart - the pumping mechanism of the body, the organ that allows for blood to be pumped around the body with strong pressure. The heart itslef has a mechanism of electroconductivity to ensure the heart pumps (contracts and then relaxes) blood.
Click on this youtube link to see how the blood circulates around the body with oxygen rich and oxygen poor blood. http://www.youtube.com/watch?v=D3ZDJgFDdk0
Reference:
Johnson, M. D. (2010). Human Biology: Concepts and Current Issues (5th ed.). San Francisco: Pearson Education.
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