THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY
Lung mucous cells. Transmission electron micrograph (TEM) of mucous cells (right) in lung tissue. At left is a blood vessel with red blood cells. Mucus (dark grey droplets) is a substance secreted to protect epithelial cells, in this case in the respiratory system. In the lungs, it is also known as airway surface liquid (ASL). Magnification: x900 when printed at 10 centimetres across.
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