MOREDUN ANIMAL HEALTH LTD / SCIENCE PHOTO LIBRARY MOREDUN ANIMAL HEALTH LTD / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph of a section of healthy lung tissue, showing the microscopic air sacs (alveoli) where gas exchange takes place. The walls of the alveoli contain many tiny capillaries carrying carbon dioxide-rich blood from the heart. As the blood passes through the capillaries it absorbs oxygen and releases its stored carbon dioxide. Magnification: x133 at 35mm size.
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