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The Human Body.

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Presentation on theme: "The Human Body."— Presentation transcript:

1 The Human Body

2 The body systems Skeletal Muscular Digestive Respiratory Circulatory Excretory Immune Nervous Endocrine Reproductive Integumentary

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: Humans Animals Soil Water Inanimate objects

6 Pathogens can be transmitted from reservoir to host in 4 ways: Pathogens are disease causing organisms 1. Direct contact: STDs, cold virus 2. Airborne: strep throat, measles, TB 3 Objects: food poisoning 4. intermediate organism-vector; vectors are most commonly insects

7 Why do bacteria and viruses make you sick?
Bacteria produce toxins- destroys tissues Viruses take over the cell. Endemic- constantly present Epidemic- many people affected

8 Treating disease Antibiotics: produced naturally by fungi and some bacteria. Affective against bacteria- NO EFFECT ON VIRUSES Note: ANTIBODIES AND ANTIBIOTICS ARE TWO TOTALLY DIFFERENT THINGS Interferon- 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 disease Immune 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 lysozyme White 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 WBCs Neutrophils Basophils Eosinophils Monocytes Lymphocytes

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