Blood vessels in the lung, SEM

Blood vessels in the lung, SEM

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Credit: SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Caption: Blood vessels in the lung, coloured scanning electron micrograph (SEM). Airways called bronchioles (orange) bring air into the lungs. These terminate in tiny air sacs called alveoli. The alveoli are surrounded by capillaries (green), small blood vessels with thin walls. Gases can diffuse through these walls, so the blood takes up oxygen and releases carbon dioxide for exhalation. This is a resin cast. Magnification: x70 when printed 10cm high.

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Keywords: airway, airways, alveoli, alveolus, anatomical, anatomy, biological, biology, blood, blood vessel, bronchiole, bronchioles, capillaries, capillary, circulatory, coloured, false-coloured, gaseous exchange, human body, lung, lungs, pulmonary, respiratory system, scanning electron micrograph, scanning electron microscope, sem, supply, system, vascular, vessels

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