2 The body systemsSkeletalMuscularDigestiveRespiratoryCirculatoryExcretoryImmuneNervousEndocrineReproductiveIntegumentary
3 Disease- a disruption of homeostasis Immune system- protects you against “foreign invaders” such as bacteria
4 50% of diseases are caused by bacteria Koch’s postulates: established a procedure tying a specific bacteria to a disease. Know them.
5 For a disease to continue, there must be a source- called a reservoir Examples:HumansAnimalsSoilWaterInanimate objects
6 Pathogens can be transmitted from reservoir to host in 4 ways: Pathogens are disease causing organisms1. Direct contact: STDs, cold virus2. Airborne: strep throat, measles, TB3 Objects: food poisoning4. intermediate organism-vector; vectors are most commonly insects
7 Why do bacteria and viruses make you sick? Bacteria produce toxins- destroys tissuesViruses take over the cell.Endemic- constantly presentEpidemic- many people affected
8 Treating diseaseAntibiotics: produced naturally by fungi and some bacteria.Affective against bacteria- NO EFFECT ON VIRUSESNote: ANTIBODIES AND ANTIBIOTICS ARE TWO TOTALLY DIFFERENT THINGSInterferon- fights viruses. Produced by specialized cells
9 You have your own built in defense system- called your immune system You have your own built in defense system- called your immune system. It protects you against infectious diseaseImmune system-specialized cells- white blood cells- that produce specialized products
10 Innate immunity-earliest defense system Skin and body secretions- sweat, saliva and tears contain lysozymeWhite blood cells-circulate in your blood and perform a variety of functions-
11 WBCs responsible for inflamation- redness, swelling, pain and heat WBCs also engulf pathogens- called phagocytosis- phagocytosis means eating or engulfing bacteria
12 5 main types of WBCsNeutrophilsBasophilsEosinophilsMonocytesLymphocytes
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