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 (/ËkaepÉ¨lÉriz/ ËkÃ¦pÉ¨lÉriz IN; /us/ kÉËpÉªlÉriz IN) uk are the smallest of a'body s blood (vessels and lymph) vessels that make up the. Microcirculation their endothelial linings are only one cell layer. thickymphatic capillaries are slightly larger in diameter than blood capillaries, and have closed ends (unlike the loop structure of blood capillaries). This structure permits interstitial fluid to flow into them but not out.