Trachea lining, TEM

Trachea lining, TEM


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Trachea lining. Transmission electron micrograph (TEM) of a transverse section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs. The epithelial lining consists of cells that have hair-like cilia (yellow, upper left) on their surface and mucus-secreting glands. Mucus secreted by the glands traps debris, such as dust particles or bacteria, in the inhaled air, while the beating of the cilia moves the mucus and particles upwards out of the respiratory tract, helping to keep the lungs and airways clear and prevent infection. Clear basal bodies (yellow rings) and mitochondria (purple) are visible in the cell bodies. Magnification: x7000 when printed 10 centimetres wide.

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