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Essay heading: Biology
 
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Issue: Science
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Date added: May 29, 2002
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No of pages / words: 3 / 813
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You can also see that the villus has a network of capillaries, which are very tiny blood vessels. The villus also has another type of tiny vessel known as a lacteal, which fills with milky white fluid known as chyle after a fatty meal. Capillaries Capillaries are very thin and fragile they are actually only one epithelial cell thick...
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They are so thin that blood cells can only pass through them in single file. The exchange of oxygen and carbon dioxide takes place through the thin capillary wall. The red blood cells inside the capillary release their oxygen which passes through the wall and into the surrounding tissue. The tissue releases its waste products, like carbon dioxide, which passes through the wall and into the red blood cells...
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