SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Trachea lining. Coloured scanning electron micrograph (SEM) of a section through the lining of the trachea (wind pipe). The trachea links the larynx (voice box) to the lungs. At upper left are pseudostratified ciliated columnar epithelial cells, which line the trachea. The hair-like cilia (yellow) on their surface beat to move mucous, and particles trapped in it, upwards out of the respiratory tract. This helps to keep the lungs and airways clear and prevent infection. At right is the basement membrane, a layer of connective tissue that supports the epithelial cells.
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