Lovely SEM image of pseudostratified ciliated columnar epithelium. This tissue lines the trachea and upper respiratory tract, and is responsible for sweeping debris out of your lungs, up your wind pipe, and into the back of your throat where you’ll either a) cough it out or b) swallow it. People who are smokers are constantly killing off these cells, which is why smokers are so prone to lung infections; they lack the ciliated cells to keep crap out of their lungs.
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