Microbes And Natural Barriers In Your Body

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To learn how natural barriers function to protect your body from infection
To learn how special cells in blood form part of the defence or immune system of your body.

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Microbes And Natural Barriers In Your Body

  1. 1. MICROBES & NATURAL BARRIERS IN YOUR BODY www.sciencetutors.zoomshare.com
  2. 2. NATURAL BARRIERS Would you be worried if you find out that someone in the class had a particular infectious disease, e.g. chicken pox or flu. I will be worried: Hands up I can’t be bothered : Hands down www.sciencetutors.zoomshare.com
  3. 3. I will be worried: Hands up Explain Why you will be worried. Would you be worried if you find out that someone in the class had a particular infectious disease, e.g. chicken pox or flu. www.sciencetutors.zoomshare.com
  4. 4. I can’t be bothered : Explain why you can’t be bothered www.sciencetutors.zoomshare.com
  5. 5. NATURAL BARRIERS <ul><li>Read Learning Objectives and make notes of keywords or phrases </li></ul><ul><li>Objectives </li></ul><ul><li>To learn how natural barriers function to protect your body from infection </li></ul><ul><li>To learn how special cells in blood form part of the defence or immune system of your body. </li></ul>www.sciencetutors.zoomshare.com
  6. 6. Outcomes <ul><li>L recognise the skin, chemical in tears and sweat as part of your body's natural barrier to infection </li></ul><ul><li>I State how the white blood cells acts as a defence mechanism for the body. eg engulfing bacteria. </li></ul><ul><li>H . State specifically that white blood cells produce antibodies in response to microbes invading the body </li></ul>www.sciencetutors.zoomshare.com
  7. 7. NATURAL BARRIERS <ul><li>Read Learning Objectives and make notes of keywords or phrases </li></ul><ul><li>Objectives </li></ul><ul><li>To learn how natural barriers function to protect your body from infection </li></ul><ul><li>To learn how special cells in blood form part of the defence or immune system of your body. </li></ul>www.sciencetutors.zoomshare.com
  8. 8. Brainstorm Keywords <ul><li>Introduce the keywords/phrases to the class </li></ul><ul><li>Defence </li></ul><ul><li>Infection </li></ul><ul><li>Immunity </li></ul><ul><li>Barriers </li></ul><ul><li>Antibodies </li></ul><ul><li>Special Blood cells </li></ul>www.sciencetutors.zoomshare.com
  9. 9. IMMUNITY <ul><li>Immunity is the body's capability to repel foreign substances and cells. </li></ul><ul><li>Two Types of Immunity </li></ul><ul><li>Nonspecific Immunity </li></ul><ul><li>Specific Immunity </li></ul><ul><li>You MUST know types of Immunity </li></ul>www.sciencetutors.zoomshare.com
  10. 10. Nonspecific Immunity The nonspecific responses are the first line of defense our body’s have against microbes. Nonspecific responses block the entry and spread of disease-causing agents example bacteria or fungus or virus. Some very familiar examples of nonspecific response are..... www.sciencetutors.zoomshare.com
  11. 11. Nonspecific Immunity YOU MUST KNOW THAT Physical barriers in your body are the first line of defense. <ul><li>Our skin secrete chemicals that retard the growth of bacteria. </li></ul><ul><li>Mucus line all body cavities which open to the outside e.g. respiratory, digestive, urinary, and reproductive tracts. Mucus produce enzymes that breakdown/destroy bacteria cell walls. </li></ul>www.sciencetutors.zoomshare.com
  12. 12. NATURAL BARRIERS IN YOUR BODY Indicate in the boxes if parts shown are specific or nonspecific?
  13. 13. SPECIFIC IMMUNITY Highly specific responses or immunity are the second line of defense in your body and are tailored to an individual threat or tailored to carry out attack on microbes in specific ways. YOU MUST KNOW THAT Chemical barriers in your body are the second line of defense. www.sciencetutors.zoomshare.com
  14. 14. FIGHTING INFECTION <ul><li>Show Animation IB2.3 Fighting infection: round two to illustrate antibody production. </li></ul>http:// 192.168.4.3/groups/science/science/b2/resources/anims/IB2.3.htm <ul><li>The white Blood Cells (also known as WBC) are continually on the lookout for signs of disease. </li></ul><ul><li>Ways by which they attack </li></ul><ul><li>Some will produce chemicals called antibodies that will overpower the bacteria. OR </li></ul><ul><li>They surround or engulf bacteria and kill them. </li></ul>www.sciencetutors.zoomshare.com
  15. 15. NATURAL BARRIERS <ul><li>A = Eye </li></ul><ul><li>B = Nose </li></ul><ul><li>C = Oesophagus </li></ul><ul><li>D = Stomach </li></ul><ul><li>2. Parts that stops microbes entering the body – Eyes, Nose, Skin, Oesophagus, Platelets </li></ul><ul><li>3. Parts of that kills try to kill microbes – E, F, D </li></ul><ul><li>4. Part B is gut sticky mucus to trap bacteria. Part D is acidic </li></ul><ul><li>5. Scabs are formed quickly over your cut to stop infection or bacteria getting into your body </li></ul>www.sciencetutors.zoomshare.com
  16. 16. LESSON REVIEW <ul><li>Q How do humans prevent disease? </li></ul><ul><li>How do we fight diseases? </li></ul><ul><li>How do we prevent the spread of diseases? </li></ul><ul><li>http://www.quia.com/rr/418209.html </li></ul>www.sciencetutors.zoomshare.com

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