Lung, Alveoli, SEM

Scanning electron micrograph of lung showing interior of alveolus. Thin type 1 alveolar cells conform to the rounded contour of the underlying capillaries. The boundaries of adjacent polygonal cells appear as linear ridges. 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. No magnification.

Credit
Science Source / Don W. Fawcett

Dimensions
4500 x 3125 pixels

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

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