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What Cause Diseases?

What Cause Diseases?. Chapter 18. What is a disease?. A disease is a condition that affects the proper functioning of the body or mind. 2 Types of diseases. Communicable Diseases that can spread. Example: the common cold Noncommunicable Diseases that do not spread

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What Cause Diseases?

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  1. What Cause Diseases? Chapter 18

  2. What is a disease?

  3. A disease is a condition that affects the proper functioning of the body or mind.

  4. 2 Types of diseases • Communicable • Diseases that can spread. • Example: the common cold • Noncommunicable • Diseases that do not spread • Example: Cancer and Diabetes

  5. Where do communicable disease come from?

  6. Simply GERMS (aka Pathogens)

  7. 4 Classes of Pathogens • Viruses 2. Bacteria 3. Protozoa 4. Fungi

  8. How are these germs spread?

  9. Examples • Direct contact (shaking hands) • Indirect contact (sneezing, coughing) • Eating or drinking contaminated food or liquid (sharing a drink/food) • Contact with animals or insects (bites) • Important terminology: • Contagious- A disease that can be spread to others by direct or indirect contact. • Does washing your hands really work???

  10. What types of defenses does our body have?

  11. How our body plays defense • Skin (our 1st line of defense) • Body Fluids (saliva, tears, etc.) • Mucous Membranes- Tissues that line the inside of your mouth, throat, and nose. • Coated with a sticky fluid called mucous which traps and destroys germs

  12. If those don’t work… • The Immune System • A group of cells, tissues, and organs that fight disease • Important parts: • Lymphocytes: white blood cells that attack harmful germs • Antibodies: chemicals produced by lymphocytes to fight specific germs or diseases.

  13. What about a vaccine? • Dead or weakened germs introduced into your body. • Why? • This causes the immune system to make antibodies to fight a specific pathogen

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