Human lung alveoli and vein, SEM

Human lung alveoli and vein, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Human lung alveoli and venule (small blood vein), coloured scanning electron micrograph (SEM). The lungs are a pair of air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic. The bronchioles eventually end in clusters of microscopic air sacs called alveoli. In the alveoli, oxygen from the air is absorbed into the blood. Carbon dioxide, a waste product of metabolism, travels from the blood to the alveoli, where it can be exhaled. Between the alveoli is a thin layer of cells called the interstitium, which contains blood vessels and cells that help support the alveoli. Magnification: x58 when shortest axis printed at 25 millimetres.

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Keywords: 92808a, airway, alveolar, alveoli, alveolus, blood vein, blood vessel, colored, coloured, false-colored, false-coloured, human, human body, human lung, lung, lung alveoli, lung tissue, lung venule, lung venules, medical, organ of respiration, respiration, respiratory system, scanning electron micrograph, sem, venule

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