Blood Circulation In The Human Body
Blood Circulation In The Human Body
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The circulatory system, consisting of the heart, arteries, capillaries and veins, is the pumping mechanism that transports blood throughout the body. In the heart the left ventricle contracts, pushing red blood cells into the aorta, the bodies largest artery. From here, blood moves through a series of increasingly smaller arteries until it reaches a capillary, the junction between arteries and veins. Here, oxygen molecules detach from the red blood cells and slip across the capillary wall into body tissue. Now, de-oxygenated, blood begins its return to the heart, it passes through increasingly larger veins to eventually reach the right atrium. It enters the right ventricle, which pumps it through the pulmonary arteries into the lungs, to pick up more oxygen. Oxygenated, blood re-enters the left atrium and moves into the left ventricle and the bloods journey begins again.
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Filed under Science & Technology by on Feb 20th, 2010. 
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