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| Description: Table 37.2 Examples of Surface Barriers Physical Mechanical Chemical Epithelia that line tubes and cavities such as the gut and eye sockets; intact skin; established populations of normal flora Mucus; broomlike action of cilia; flushing action of tears, saliva, urination, diarrhea Secretions (sebum, other waxy coatings); low pH of urine, gastric juices, urinary and vaginal tracts; lysozyme
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