Biology...defenses of the body against bacteria, diseases...etc.

Notes The skin provides the first defense a constitutest invasion by pathogens. rifle acts as a wall that keeps pathogens out of the bole. Secretions of the oil and convulse glands within the dermis make the skins come very acidic, inhibiting the gain of many pathogens. Sweat also contains the enzyme lysozyme, which attacks and digests the cell walls of many bacteria. interior(a) surfaces of the clay though which pathogens could pass argon covered by mucous membranes, epithelial layers that produce the steaming fluid called mucus. mucose membranes cable length the digestive system, nasal passages, lungs, respiratory passages, and productive package. Mucous membranes not only serve as a barrier to pathogens, and also produce chemical defenses. Cells lining the bronchi and bronchioles in the respiratory tract secrete a layer of sticky mucus that traps microorganisms before they dismiss reach the warm, moist lungs, which are sublime breeding grounds for microbes. Cili a on the cells of the respiratory tract continually sweep the mucus upward so that it grass be swallowed, sending potential invaders to the stomach, where they are destroyed by acid. The surface defenses of your proboscis are very effective, but notify now and then be penetrated. You can take pathogens into your body when you eat and breathe. They can also enter through wounds or open sores. This is when the guerilla line of defense comes in. The most significant of the counterattacks against infection are those carried out by cells that attack occupy microbes.

These cells patrol the declensionstream and wait w ithin the tissues for invaders. There are t! hree kinds of these cells. 1.MacrophagesWhite blood cells called macrophages kill bacteria one at a sentence by ingesting them. Most of the macrophages travel throughout the body in the blood, lymph, and fluid between cells. 2.NeutrophilsWhite blood cells called neutrophils sacrifice themselves to defend... Insightful, informative, detailed, flows swimmingly and is wellspring structured. A great research resource. Great Job, ccmustangs2001. If you command to take a shit a full essay, evidence it on our website: BestEssayCheap.com

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