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Describe this picture.

Describe this picture. Sponge #1. 1. What do you think the white blood cell is doing in this picture? 2. Why do you not get sick EVERYTIME disease causing germs invade your body?. White blood cell E. Coli (bacteria). Sponge #1.

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Describe this picture.

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  1. Describe this picture.

  2. Sponge #1 1. What do you think the white blood cell is doing in this picture? 2. Why do you not get sick EVERYTIME disease causing germs invade your body? White blood cell E. Coli (bacteria)

  3. Sponge #1 1. What do you think the white blood cell is doing in this picture? The white blood cell is attacking the invader 2. Why do you not get sick EVERYTIME disease causing germs invade your body? The white blood cells attack and destroy invaders before you get ill. They protect you. White blood cell E. Coli

  4. KEY CONCEPTGerms cause many diseases in humans.

  5. Diseases caused by germs, such as the E. Coli bacteria can be fatal (death) • 1330-1352, the bacteria that caused the “Black Death” or the Plague originated from fleas on rats • Has killed approx. 100 MILLION people • New diseases • HIV • SARS • Avian Flu (bird flu) • Swine Flu

  6. Germ theory proposes that microorganisms cause diseases. • led to rapid advances in understanding disease • Can be infectious (polio, flu), caused by germs • or noninfectious (cancer, heart disease) caused by genes or lifestyle

  7. Disease-causing agents are called pathogens. • What would happen if pathogens were eliminated? • We wouldn’t get sick

  8. There are different types of pathogens. • Bacteria are single-celled organisms. • cause illness by destroying cells • release toxic chemicals • Exs: • E. Coli • Salmonella • “Food Poisoning”

  9. Viruses are disease-causing strands of DNA or RNA that are surrounded by a protein coat. • Take over a healthy cell • Force cells to produce more of the virus • Smaller than bacteria • Exs: • HIV • Influenza • Herpes • *Common Cold • AIDS

  10. take nutrients from host’s cells • occur in warm and damp places • Fungi can be multicellular or single-celled. Ex: Athlete’s foot, yeast, mold

  11. Prey on other cells • use host cells to complete their life cycles • take nutrients from host cell • Ex: Malaria, dysentery • Protozoa are single-celled organisms

  12. grow and feed on a host • possibly kill the host • Parasites are multicellular organisms. Ex: Heart worm Round worm Elephantiasis- mosquitos

  13. Vectors any person or animal that carries and transmits a pathogen to another living organism. • Direct contact requires touching an infected individual. Includes: • kissing • sexual intercourse • hand shaking • bite Ex: Lime Disease- ticks Malaria- mosquito West Nile Virus- mosquito Rabies- rabid animal HIV- infected person tick

  14. Pathogens can enter the body in different ways. • Direct contact require an infected person or animal to physically touch a healthy person Ex: Rabies, HIV • Indirect contact does not require touching an infected individual. • touching an infected surface • breathing in infected air Ex: SARS Tuberculosis

  15. Different pathogens cause common infectious diseases.

  16. Bacteria Videos Beneficial Bacteria Harmful Bacteria Types Functions Examples • Types • Functions • Examples Take notes on the two videos

  17. Beneficial Bacteria Harmful Bacteria Take over ponds, etc. Kills existing life Food Grows on food (spoils) Mouth Feed on food in between teeth Must brush and floss Infect Open sores Difficult to kill May have a slippery outer capsule • Decomposers • Break down dead material • Soil • Makes it fertile so plants can grow • Intestines • Aids in digestion • Produces vitamins • Food • Cheese, sour cream, yogurt • Medicine- • help fight diseases • Sewage Treatment • Oil spills

  18. Homework Draw a double-bubble map comparing and contrasting bacteria and viruses (pg. 942 & notes)

  19. Smaller than Bacteria Have a protein coat Single- celled Pathogens HIV Bacteria Viruses Flu E. Coli microscopic Force cells to produce more virus Release toxic chemicals Infectious Common cold Larger than viruses

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