4.5 KINES126 - KINES126.1 Monday, April 5, 1999...

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KINES126.1 Monday, April 5, 1999 Announcements: Lecture Notes: DISEASE AND THE IMMUNE SYSTEM AIDS is caused by a tiny germ called a virus. A virus is a tiny particle that has the ability to infect cells. Viruses are thousands of times smaller than cells and are millions of times smaller than a human. When cells become infected with a virus they start to die. If too many cells die, the person becomes sick. The virus that causes AIDS is HIV. Viruses attack the immune system. The immune system is the body's defense system. This defense system provides us with protection from disease. The parts of the immune system. skin a.) protective layer b.) We have skin to hold heat inside the body, regulate temperature, and keeps out germs. c.) Our skin is a mildly acidic surface which is a poor habitat for bacteria. mucus membrane a.) eyes, nose, mouth, anus, vagina, opening of penis b.) Secretes an enzyme that degrades foreign substances.
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This note was uploaded on 02/21/2008 for the course KINES 126 taught by Professor Maney during the Spring '99 term at Pennsylvania State University, University Park.

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4.5 KINES126 - KINES126.1 Monday, April 5, 1999...

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