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