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Functions: › Transports oxygen and glucose to the cells to produce energy › Picks up waste such as carbon dioxide from the cells › Transports the white blood cells to fight infection Major organs of the circulatory system are: › heart › blood vessels › blood. Circulation The heart is a hollow muscular organ that can hold and pump blood when the muscles of the heart contract. The Heart Lub If you listen to your heartbeat, it makes a lub dub sound. The lub is when blood is pushed out of the heart into the body and the dub is the reloading of the heart with more blood ready to push it out to the body Dub The Heart › 4 chambers ( or compartments ) 2 upper chambers : Left Atrium Right Atrium 2 lower chambers : Left Ventricle Right Ventricle The Heart Carries nutrients, water, oxygen and waste products to and from your body cells. Pumped by your heart. http://hes.ucf.k12.pa.us/gclaypo/circdia.html Components of Blood: red cells and white cells › Red Blood Cells: the ability to carry oxygen and carbon dioxide in and out of body cells. › White Blood Cells: have the ability to fight infection. Arteries: carry blood away from the heart and must have thick, muscular walls that can withstand pressure of blood pumped by the heart. Capillaries : Have walls that are only one cell thick to allow materials to be exchanged between the blood and the body’s cells. Veins : carry blood back to the heart and are not as muscular as arteries because the pumping pressure of the heart has little effect by the time the blood is in the veins. http://users.tpg.com.au/users/amcgann/body/circulatory.htm l