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Organs of Respiration.The walls of these little air cells contain capillary blood vessels through which the blood circulates in order to be purified. The lung itself is composed of elastic, rubber-like tissue, which is stretched when the chest is expanded, so that the air is forced into the air cells, and which collapses when the chest is contracted, so that the air is forced out of the air cells. In this way provision is made for a constant change of the air in the air cells. But first, if you want to come back to this web site again, just add it to your bookmarks or favorites now! Then you'll find it easy! Also, please consider sharing our helpful website with your online friends.
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