F/col Tem Of Capillary In Alveolar Septum Of Lung
by Cnri/science Photo Library
Title
F/col Tem Of Capillary In Alveolar Septum Of Lung
Artist
Cnri/science Photo Library
Medium
Photograph - Photograph
Description
False-colour transmission electron micrograph (TEM) of human lung tissue, showing an alveolar septum, the partition between the alveoli (air sacs) where gas exchange takes place. Blood vessels (capillaries) extend across the entire septum, coloured mauve in this image & filled with red blood cells (in red). The purple-coloured cell in centre of image with a large (outlined) nucleus is one of the two alveolar cell types or pneumocytes. Type II cells are believed to secrete surfactant, a substance that reduces alveolar surface tension & prevents the air sacs from collapsing. Magnification: x2,200 at 6x7cm size.
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September 21st, 2018
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