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| | MedlinePlus Medical Encyclopedia: Immune response |
 | | The immune response is how your body recognizes and defends itself against bacteria, viruses, and substances that appear foreign and harmful to the body. |
 | | Some of these barriers are the skin, stomach acid, mucus (which traps bacteria and small particles), the cough reflex, and enzymes in tears and skin oils. |
 | | The inflammatory response (inflammation) occurs when tissues are injured by bacteria, trauma, toxins, heat, or any other cause. |
| www.nlm.nih.gov /medlineplus/ency/article/000821.htm (1151 words) |
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