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How do chemical barriers protect the body from pathogens?
Chemical Barriers Chemical barriers destroy pathogens on the outer body surface, at body openings, and on inner body linings. Sweat, mucus, tears, and saliva all contain enzymes that kill pathogens. Urine is too acidic for many pathogens, and semen contains zinc, which most pathogens cannot tolerate.
What is the most comprehensive barrier to pathogens?
As Figure 1 shows, the most comprehensive barrier is the waterproof layer of skin that covers the body鈥檚 surface. Human skin keeps most pathogens out as long as it remains intact.
What is the difference between biological and chemical barriers?
Vocabulary Language: English 鈻? Term Definition biological barrier A living organism that helps protect the … chemical barrier A barrier that destroys pathogens on the … immune system body system that consists of skin, mucou … mechanical barrier Barrier that physically block pathogens … 2 more rows …
What blocks pathogens from entering the body?
Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense the body has. The outer layer of the skin is tough and very difficult for pathogens to penetrate.