1. Chapter Review Chapter 21 Preview Key Terms Key Ideas Graphics Critical Thinking

2. Chapter Review Chapter 21 Using Key Terms 1.A __________ is a disease that spreads quickly through the human populations all over the world.

3. Chapter Review Chapter 21 Using Key Terms 1.A pandemic is a disease that spreads quickly through the human populations all over the world.

4. Chapter Review Chapter 21 Using Key Terms 2.___________________ is the virus that primarily infects cells of the immune system and that causes AIDS.

5. Chapter Review Chapter 21 Using Key Terms 2.Human immunodeficiency virus (HIV) is the virus that primarily infects cells of the immune system and that causes AIDS.

6. Chapter Review Chapter 21 Using Key Terms 3.___________________ is the disease that is caused by HIV infection, which weakens the immune system.

7. Chapter Review Chapter 21 Using Key Terms 3.Acquired immune deficiency syndrome (AIDS) is the disease that is caused by HIV infection, which weakens the immune system.

8. Chapter Review Chapter 21 Understanding Key Ideas 4.About how many people in the United States are infected with HIV? A. 100-200 B. 10,000-12,000 C. 850,000-900,000 D. 3,000,000

9. Chapter Review Chapter 21 Understanding Key Ideas 4.About how many people in the United States are infected with HIV? A. 100-200 B. 10,000-12,000 C. 850,000-900,000 D. 3,000,000

10. Chapter Review Chapter 21 Understanding Key Ideas 5.What can happen during Phase III of HIV infection? A. opportunistic infection B. few symptoms C. low T cell count D. both (a) and (c)

11. Chapter Review Chapter 21 Understanding Key Ideas 5.What can happen during Phase III of HIV infection? A. opportunistic infection B. few symptoms C. low T cell count D. both (a) and (c)

12. Chapter Review Chapter 21 Understanding Key Ideas 6.Which of the following behaviors has the highest risk for spreading HIV? A. shaking hands with an infected person B. sexual intercourse with an infected person C. using a glass used by an infected person D. kissing an infected person

13. Chapter Review Chapter 21 Understanding Key Ideas 6.Which of the following behaviors has the highest risk for spreading HIV? A. shaking hands with an infected person B. sexual intercourse with an infected person C. using a glass used by an infected person D. kissing an infected person

14. Chapter Review Chapter 21 Understanding Key Ideas 7.Which of the following is one way you can eliminate the risks of HIV and AIDS? A. drug use B. abstinence C. sexual activity D. sharing needles

15. Chapter Review Chapter 21 Understanding Key Ideas 7.Which of the following is one way you can eliminate the risks of HIV and AIDS? A. drug use B. abstinence C. sexual activity D. sharing needles

16. Chapter Review Chapter 21 Interpreting Graphics 8.How many reported cases of HIV infection occurred in the United States in 1999?

17. Chapter Review Chapter 21 Interpreting Graphics 8.How many reported cases of HIV infection occurred in the United States in 1999? More than 400,000

18. Chapter Review Chapter 21 Interpreting Graphics 9.What is the percentage increase in the reported number of people with HIV infection from 1999 to 2000?

19. Chapter Review Chapter 21 Interpreting Graphics 9.What is the percentage increase in the reported number of people with HIV infection from 1999 to 2000? Approximately 10 percent [(450 – 410)/410 x 100 = 9.8]

20. Chapter Review Chapter 21 Critical Thinking 10. How would a teen know if he or she is at risk for HIV infection?

21. Chapter Review Chapter 21 Critical Thinking 10. How would a teen know if he or she is at risk for HIV infection? A teen would know that he or she is at risk of getting infected with HIV if he or she engages in high-risk behaviors. These behaviors include engaging in sexual activity and sharing needles or drug injection equipment with an infected person.