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23/05/2017 Defence against Disease L.O: To understand how the body defends itself against disease and how diseases are transmitted Starter: 23/05/2017 1. Look in your book from last lesson revise 2. Name the 3 types of microbe and rank from biggest to smallest 3. Add units for scale. 4. State one feature of each cell 5. Finally, list the ways that disease can be transmitted (passed from one person to another) Microbes: our defence against them 23/05/2017 White blood cells :---------------------- 1) They eat the microbe 2) They produce antibodies to neutralise the microbe 3) The produce antitoxins to neutralise the poisons produced by microbes The skin acts as a barrier Stomach produces stomach acid If our skin is cut platelets seal the wound by clotting Tears contain an enzymes that kills bacteria The breathing organs produce mucus to cover the lining of these organs and trap the microbes Fighting disease NATURAL IMMUNITY This is when antibodies are produced by a person when needed or they are passed on by the mother during pregnancy. ARTIFICIAL IMMUNITY A vaccine with dead microbes is injected – the body is “tricked” into producing antibodies ready for the real thing. This is called PASSIVE IMMUNISATION 23/05/2017 Using Antibiotics Antibiotics can be used to kill bacteria. However, there are two problems: 1) Overuse of antibiotics can lead to bacteria becoming resistant 2) Antibiotics have no effect on a virus, like the common cold. A virus must be allowed to “run its course”. 23/05/2017 WORD BINGO! Draw a 4x4 grid Select some of these words to put in your grid in a RANDOM order. Yeast White blood cell Bread Beer fungus Earwax Chicken pox stomach acid engulf quorn virus microbe skin food poisoning tears antibiotic scabs bacteria infect flu