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Bronchial lining. Coloured Scanning Electron Micrograph of the lining of a narrow air passage (bronchiole) in the lung, showing the tiny hairs (cilia) which protrude from it. These cilia are produced by cells in the bronchial epithelial lining. They help to keep the lungs free of infection. Their rhythmic movements move bacteria & other particles away from the gas-exchanging parts of the lungs, towards the throat where they can be swallowed or coughed up. Magnification: x3300 at 6x6cm size.
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