ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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Computer-enhanced scanning electron microscopy (SEM) illustration of a microbe approaching the mucous membrane of the nasal epithelium. Mucous membranes of the respiratory tract provide the first line of defense for the human immune system. Goblet cells found within the epithelium of the nose secrete mucous which contains a bacteria-degrading enzyme.
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