2. LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER

3. 1 1 KS3 SCIENCE - BIOLOGY KS3 SCIENCE - BIOLOGY Fighting Disease Fighting Disease

4. HEALTH 2 2

5. 3 3 Health means that the body is working properly Health means that the body is working properly

6. HEALTH 4 4 Health can be damaged by injury, where the body is somehow hurt Health can be damaged by injury, where the body is somehow hurt

7. HEALTH 5 5 The body can also go wrong of its own accord, especially as you age, e.g. Heart failure The body can also go wrong of its own accord, especially as you age, e.g. Heart failure

8. HEALTH 6 6 Health can also be damaged by Microbes - tiny organisms which invade the body and interfere with its workings Health can also be damaged by Microbes - tiny organisms which invade the body and interfere with its workings

9. INFECTIONS 7 7

10. 8 8 In your body there are different types of microbes e.g. Viruses and Bacteria - but not all microbes are bad for you In your body there are different types of microbes e.g. Viruses and Bacteria - but not all microbes are bad for you Virus Bacteria

11. INFECTIONS 9 9 Viruses are extremely small and are just a strand of Genetic information with a Protein coat Viruses are extremely small and are just a strand of Genetic information with a Protein coat

12. INFECTIONS 10 Viruses can get into an animal’s body and then attach themselves to individual Cells Viruses can get into an animal’s body and then attach themselves to individual Cells

13. INFECTIONS 11 They then inject their genetic information into the host cell They then inject their genetic information into the host cell

14. INFECTIONS 12 New viral parcels are then replicated New viral parcels are then replicated

15. INFECTIONS 13 The growth of the virus kills the cell and breaks it open The growth of the virus kills the cell and breaks it open

16. INFECTIONS 14 The virus then spreads to other parts of the body The virus then spreads to other parts of the body Viruses can also produce poisons that harm you Viruses can also produce poisons that harm you

17. INFECTIONS 15 Bacteria are larger than viruses and are living cells that grow and reproduce very rapidly Bacteria are larger than viruses and are living cells that grow and reproduce very rapidly

18. INFECTIONS 16 Bacteria can attack body tissues or release poisons that make you feel ill Bacteria can attack body tissues or release poisons that make you feel ill

19. IMMUNITY 17

20. IMMUNITY 18 Microbes that infect your body will be recognised and attacked by White Blood Cells Microbes that infect your body will be recognised and attacked by White Blood Cells One way they do this is by engulfing the microbes One way they do this is by engulfing the microbes

21. IMMUNITY 19 When there are a lot of microbes, white blood cells produce Antibodies that cause them to clump together so they can be engulfed in groups When there are a lot of microbes, white blood cells produce Antibodies that cause them to clump together so they can be engulfed in groups

22. IMMUNITY 20 Antibodies can also attack the surface of the microbes, so that they lose their water and die Antibodies can also attack the surface of the microbes, so that they lose their water and die

23. IMMUNITY 21 White blood cells can also make chemicals which neutralise poisons made by the microbes White blood cells can also make chemicals which neutralise poisons made by the microbes

24. IMMUNITY 22 A build-up of antibodies may mean that a person develops a Natural Immunity to a disease A build-up of antibodies may mean that a person develops a Natural Immunity to a disease

25. IMMUNITY 23 Artificial Immunity can also be created by injecting antibodies, or injecting harmless microbes to stimulate the body to make its own antibodies Artificial Immunity can also be created by injecting antibodies, or injecting harmless microbes to stimulate the body to make its own antibodies