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wood prints alveolus wood prints lung wood prints air sac wood prints alveolar septum wood prints septum wood prints alveolar wood prints capillary wood prints alveolar cell wood prints type ii wood prints cell wood prints human body wood prints anatomy wood prints respiratory system wood prints lungs wood prints

photographs alveolus photos lung photos air sac photos alveolar septum photos septum photos alveolar photos capillary photos alveolar cell photos type ii photos cell photos human body photos anatomy photos respiratory system photos lungs photos

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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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