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.
Capillaries are tiny blood vessels that connect arteries and veins, which may be visible on the skin surface, especially where skin is thin, such as the face. Broken capillaries look like thin red threads on the skin that have a webbed appearance, so that they are called spider veins.roken capillaries on your face are more prominent as you age, as your skin usually gets thinner, which makes it easier to see the veins. Excessive alcohol intake. or smoking. Chronic alcohol intake can increase blood pressure, which makes the veins in the face to enlarge.