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The Circulatory System
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Blood Cell Composition
red blood cells (RBC) - erythrocytes - contain hemoglobin manufactured from bone marrow & liver recycles Carry Oxygen life span of days white blood cells (WBC) - leukocytes - fight infection manufactured in the spleen renewed every 10 days platelets - thrombocytes - clot blood life span of 5-9 days plasma: 55% of the total blood volume 91% water and 9% solids (proteins)
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The Cardiovascular System
Blood Vessels -A network of tubes Arteriesarterioles Carry blood away from the heart Elastic – high pressure Carry oxygenated blood (O2) Red
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VeinsVenules Carry blood towards the heart Valves – low pressure, prevent backflow Carry deoxygenated blood (Co2) Blue
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Capillaries (Purple) – where gas exchange takes place. One cell thick Very narrow
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H:\3190\Drendel\Biology\Human Body\Cardiovascular video.htm
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