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MICROBES CAUSE DISEASE!!

MICROBES CAUSE DISEASE!!. Messana Science 8 Chapter 25. MICROBES. = Microorganism, Microscopic Organism Bacteria Virus Parasite Fungi Found EVERYWHERE! !... water, surface of living things, inside living organisms. DISEASE.

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MICROBES CAUSE DISEASE!!

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  1. MICROBES CAUSE DISEASE!! Messana Science 8 Chapter 25

  2. MICROBES • = Microorganism, Microscopic Organism • Bacteria • Virus • Parasite • Fungi • Found EVERYWHERE!!...water, surface of living things, inside living organisms

  3. DISEASE • Caused by a microbe entering a place in the body where they aren’t supposed to be • Organism experiences impaired function • Show symptoms = your body’s response to disease (fever, vomiting, joint pain, skin condition, diarrhea, etc.) • Can be infectious/communicableOR non-infectious/non-communicable

  4. Youtube…. • Bacteria

  5. E. Coli O157:H7 can make you very sick. Harmless bacteria on the stomach lining Streptococcus can cause strep throat. BACTERIA • Single celled organisms – ALIVE! • Very small, Needmicroscopeto see • Prokaryotic • Can be found on most materials and surfaces – Soil, Water, Air, etc. • Can live: With/WO O2, extreme HOT/COLD. Bacteria doubles, reproduces VERY quickly :0 • Billions on your skin and in your body’s digestive track right now! • Alexander Fleming~ 1928…accidentally grew mold; led to discovery of PENICILLIN!!

  6. BACTERIA • Different shapes = sphere, rod, spiral • Have cell membrane, cell wall, & capsule • Cytoplasm contains genetic material floating freely + ribosomes (no nucleus or other organelles) • Has flagellum & cilia • Can move, reproduce, eat, etc.

  7. Typical Bacterial Cell

  8. Helpful vs. Harmful Bacteria • Harmful Bacteria = Germs, Pathogens (Greek: Pathos ~ means “suffering”) • Cause disease by releasing toxins into body • Toxins are the waste products from bacteria • Bacterial infections  fever, swelling, rash • Treat with ANTIBIOTICS! Antibiotic resistance occurs when antibiotics are OVERUSED!! • Helpful Bacteria: (ex. found in intestines) • Eat other more harmful substances • Help plants and animals release nutrients to be used by organism • Digest food in your stomach

  9. Clean skin has about 20 million bacteria per square inch

  10. Youtube • : • //www.youtube.com/watch?v=3xRttWuf3wQ • http://www.youtube.com/watch?v=4lmwbBzClAc

  11. Viruses • VERY small! • Composed of DNA or RNA & • protein coat = CAPSID • NOT A LIVING CELL!! • Can’t reproduce, eat, move, or maintain homeostasis • Must get inside HOST CELL to reproduce • Must fit cell membrane like “lock and key”

  12. Virus Replication • If virus finds suitable living host cell…uses the enzymes & organelles of host cell to make more viruses • DNA or RNA directs host cell to make copies of virus particle • Copies of virus cause host cell to EXPLODE! • Viruses go on to affect other cells

  13. Virus invading Bacterial Cell

  14. Youtube.. • Virus (HPV)

  15. Viruses • Cause diseasein plants & animals • Viral diseases are the most widespread illnesses in humans…minor as fevers…serious as some forms of cancer • Transmitted: human contact, water, food, insect bites… • Can’t treat viral infections with anything – have to run their course.. • HOWEVER~ some vaccines & anti-viral drugs used to control & prevent spread of disease (HIV/AIDS, Herpes/Shingles – Valtrax)

  16. YouTube… • Virus Rap!

  17. Parasites • An organism that has a harmful relationship with a host organism • Parasite lives on or in the host • Slowly weakens or kills host quickly • Usually SPECIALIZED ANATOMICALLY (structure of the organism) & PHYSIOLOGICALLY (function of the organism). • EX: Tapeworms-so specialized = NO digestive system. Live in small intestine & absorb food directly through skin :0

  18. Parasites…. • EX: lice, ticks, heartworm, mites, fleas, pin worms, tapeworms… • Tapeworms are flatworms that consist of a head, neck and a segmented body that can grow up to 20-30 feet long with hooks on the underside to attach to intestinal walls. :0 Tapeworm infection can be caused by ingesting tapeworm eggs or larvae, which can be found in animal meats, water, soil or animal feces • PREVENTION: Wash hands!!! Cook meat! Sanitize Water!! • Are you ready for these pictures!?

  19. Parasites

  20. Fish Parasite & Blood Parasite

  21. The Parasite Picture Gallery - Life cycles of several very common parasites.htm

  22. 9 Human Parasites You Don't Want Along for the Ride Page 3 TreeHugger#slide-top.htm

  23. PRODUCERS • Transfer sun energy into energy that can be used by cells

  24. DECOMPOSERS • Break down materials in • Dead/Decaying organisms • for reuse.

  25. http://www.mixbook.com/photo-books/nature/producers-consumers-and-decomposers-3724805http://www.mixbook.com/photo-books/nature/producers-consumers-and-decomposers-3724805

  26. J:\The Parasite Picture Gallery.mht

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