False-colour SEM of a section of human lung tissue

False-colour SEM of a section of human lung tissue

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Caption: False-colour scanning electron micrograph (SEM) of a section of the human lung, showing a blood capillary (centre) containing red blood cells, surronded by a network of alveoli (air sacs). The alveoli are the final branches of the bronchial tree, the network of airways which begins with the trachea (windpipe). The alveolar network constitutes a respiratory area in which exchange of gases (oxygen and carbon dioxide) takes place between blood (in the capillaries) and air, through the thin epithelium that separates adjacent alveoli. Magnification: x350 at 35mm size.

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Keywords: alveolus, anatomy, capillary, false-coloured, human body, lung, lungs, respiratory system

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