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