Atelectasis (/ËÃ¦táµ»ËlÉktÉsáµ»s/ uses combining forms of atel- + ectasis, from Greek: á¼ÏÎµÎ»Î®Ï, incomplete + á¼ÎºÏÎ±ÏÎ¹Ï, extension) is the collapse or closure of a lung resulting in reduced or absent gas exchange.
A single capillary is so small that it allows only one blood cell to flow through it at a time. The capillary walls are also very small, only one cell thick. These thin walls easily allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood cells and the surrounding tissue.
it is made up of the alveoli's because they have very thin walls, only one cell thick to allow exchange/diffusion of gases through it and interchange of these gases with the blood, the capillary network means the gases can be easily delivered to the lungs and absorbed into the blood at the lung surface.est Answer: Alveoli are the actual sites of gas exchange between the lungs and the blood. They are incredibly thin to allow easy diffusion of gases (oxygen and carbon dioxide) back and forth.