False-colour SEM of the capillaries in the lungs

False-colour SEM of the capillaries in the lungs

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Credit: PROFF. P. MOTTA/G. MACCHIARELLI UNIVERSITY "LA SAPIENZA", ROME/SCIENCE PHOTO LIBRARY

Caption: Microcirculation of lung: false-colour scanning electron micrograph (SEM) of a cast of the microvascular circulation of the lung, showing the network of capillaries surrounding the alveoli, the air sacs of the lung, where gaseous exchange with blood occurs. Conventional SEMs cannot reveal features such as capillary density & their three- dimensional distribution. To do so, casts are made, by injecting an unpolymerized mixture into the vascular system & allowing it to harden within the vessels. Digestion of the tissue with hydrogen peroxide solution leaves a replica of the vessels. Magnification: x160 at 6x7cm size. x220 at 4x5 inch.

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Keywords: anatomy, blood supply, capillary, circulation, false-coloured, human body, images, lung, lung cast, lungs, magnified image, micro, microscopic photos, microvascular cast, respiratory system, sem, sem cast, subjects

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