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Wall of the alveoli These thin walls contain blood vessels that take up oxygen and release carbon dioxide. (c) Oliver Kim
Alveolus The alveoli are small compartments in the lungs, where the air is breathed into and out. The thin walls of the alveoli contain blood vessels, so the oxygen can travel into the blood and carbon dioxide can be released from it into the alveoli. In patients with lung emphysema, the delicate skins that form the alveoli are damaged and breathing becomes difficult. (c) Oliver Kim
Blood vessel The used blood, which has low amounts of oxygen travels from the heart into the lungs through these blood vessels (lung arteries) whereas oxygen-rich blood flows back to the heart. In lung embolism, large lung arteries are blocked by a blood clot and can cause severe shortness of breath, failure of the heart and death. (c) Oliver Kim
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The lungs are the site of gas exchange. Oxygen from the air diffuses into the blood and carbon dioxide gas from the blood is given off into the air. For this reason, the lung contains many air spaces (the alveoli) as well as blood capillaries. <br> <br> The lungs are much like a sponge with blood capillaries surrounding the alveoli. The total surface area of all alveoli of a human lung is quite large and can be about 70 square meters, which is the size of a small apartment.
