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BiologyMay6th2007

BiologyMay6th2007 - may contribute to defense by...

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Dustin Lee 31.2: Q 1-4 Block C: Biology 1. Skin is one example of a pathogen barrier. The outer layer of the skin is comprised of tough, dead cells that most bacteria and other organisms cannot penetrate. The layer of skin is constantly shedding, which makes it difficult for bacteria to embed in it and grow. Skin also contains sweat and oil glands. These glands secrete acids and oils that prevent the growth of many microorganisms, acting as a chemical barrier. 2. In the response to mosquito bite, inflammation may occur in a tiny area. This response causes white blood cells to increase and a fever may occur. A very high fever may be dangerous, because it can destroy proteins and cause other damage. But a moderate fever
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Unformatted text preview: may contribute to defense by stimulating phagocytosis and stopping the growth of many kinds of microorganisms. 3. The third line of defense is a specific or targeted defense. To accomplish this, the immune system must be able to distinguish between its own body cells and intruders. 4. Interferon is a family of proteins produced by cells in response to becoming infected by a virus. The infected cell may die, but its interferon reaches healthy cells in the area, stimulating them to produce proteins that interfere with virus reproduction. Interferon is effective against many viruses and is therefore nonspecific. Interferon seems to be effective against viruses that cause the flu and the common cold....
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