Lung, Alveolus, EM - stock photo
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Lung, Alveolus, EM

Electron micrograph of lung showing erythrocyte filled capillaries in the thin septa between alveoli. The lungs are the primary organs of respiration in humans and many other animals including a few fish and some snails. An alveolus is an anatomical structure that has the form of a hollow cavity. Found in the lung parenchyma, the pulmonary alveoli are the terminal ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well. A bronchus, also known as a main or primary bronchus, is an airway in the respiratory tract that conducts air into the lungs. Magnification unknown.

Science Source / Don W. Fawcett

4500 x 3119 pixels

Print Size @ 300 dpi
15 x 10 inches / 38 x 26 cm

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