iphy 3430 lecture 14

iphy 3430 lecture 14 - IMMUNE SYSTEM Homeostasis depends on...

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IMMUNE SYSTEM
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Homeostasis depends on a pathogen-free environment Pathogens either directly kill or damage cells with toxins 1. Bacteria 2. Viruses 3. Fungi 4. Parasites
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Bacteria 1. Nucleus not separated from cytoplasm by nuclear membrane 2. DNA not organized into chromosomes 3. Can mutate rapidly 4. No mitochondria or chloroplasts 5. Single-celled organisms 6. Damage cells by producing enzymes or toxins that injure or disrupt human cells
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Bacteria Staphlococcus , Streptococcus , tuberculosis plague -- Yersinia ( 1346 AD killed 1/3 population of Europe) diarrhea, pneumonia, meningitis, bronchitis Antibiotics--Fleming, 1929; specificity for certain types of bacteria
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Viruses 1. Not ‘alive’--DNA or RNA and protein coat 2. DNA not organized into chromosomes 3. Depend on human cell for replication 4. Can remain latent (inactive) for periods of time examples: AIDS, pneumonia, hemorrhagic viruses (Ebola, Marburg), chicken pox, herpes, Hanta virus, smallpox, influenza (Spanish Flu 1917-1919) Antibiotics don’t work on viruses!!!
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iphy 3430 lecture 14 - IMMUNE SYSTEM Homeostasis depends on...

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