Human Biology

1.54. HIV and AIDS http://www.ck12.org

Summary

• HIV causes AIDS by destroying disease-fighting cells produced by the immune system.


• HIV spreads through contact between an infected person’s body fluids and another person’s bloodstream or
  mucus membranes; body fluids that may contain HIV include blood, semen, vaginal fluid, and breast milk.

Practice

Use the resources below to answer the questions that follow.

• HIV Replicationat http://www.youtube.com/watch?v=RO8MP3wMvqg (5:13)

MEDIA

Click image to the left for more content.

1. What are the steps of HIV infection?


2. How can understanding all the steps of infection help develop treatments to HIV?


3. What does HIV inject into a cell?
   
   
   • HIV Immunityat http://www.pbs.org/wgbh/evolution/library/10/4/quicktime/l_104_06.html
   
   
   
   


4. Not all people show the same vulnerability to HIV infection. What did scientists do when they first found
   indications that this was the case?


5. How can studying people with natural resistance to HIV help develop treatments?

Review

1. How does an HIV infection develop into AIDS?


2. Explain why HIV does not kill people but causes other illnesses to kill people infected with HIV.