microbes cause disease!!
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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MessanaScience 8
Chapter 25
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= Microorganism, Microscopic Organism Bacteria Virus Parasite Fungi Found EVERYWHERE!!...water, surface
of living things, inside living organisms
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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/communicable OR non-infectious/non-communicable
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Bacteria
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Single celled organisms – ALIVE! Very small, Need microscope to 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!!
Harmless bacteria on the stomach lining
E. Coli O157:H7 can make you very sick.
Streptococcus can cause strep throat.
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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.
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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
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: //www.youtube.com/watch?v=3xRttWuf3wQ
http://www.youtube.com/watch?v=4lmwbBzClAc
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• 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”
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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
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Youtube.. Virus (HPV)
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• Cause disease in 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)
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YouTube… Virus Rap!
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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
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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!?
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The Parasite Picture Gallery - Life cycles of several very common parasites.htm
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9 Human Parasites You Don't Want Along for the Ride Page 3 TreeHugger#slide-top.htm
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Transfer sun energy into energy that can be used by cells
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Break down materials in
Dead/Decaying organisms
for reuse.
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http://www.mixbook.com/photo-books/nature/producers-consumers-and-decomposers-3724805
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J:\The Parasite Picture Gallery.mht