1. Your Body’s Defense

2. Physical Defenses First line of defense Skin Hair Mucous Cilia Saliva
Tears
Sweat
Digestive tract

3. Skin Protects from micro-organisms entering the body
Open cuts/ sores provide entrance
Cells die and are shed

4. Sweat Our body has many sweat glands
Sweat is released to control body temp
Sweat contains acids that kill pathogens

5. Mucous Membranes Moist linings around all entrances to body
Mucous = sticky substance
Mucous traps pathogens

6. Saliva & Tears Contain enzymes that fight pathogens
Tears wash away foreign substances

7. Cilia Tiny hair-like structures Trap pathogens
Help remove mucous from body

8. Digestive Tract Moves pathogens out of body
Acids/ chemicals in digestive tract
Chemicals kill pathogens

9. Second Line of Defense Occurs after pathogen enters the body
Inflammation

10. Inflammation 1st stage of healing Increased blood flow to area
Increased size/ temperature/ redness
Caused by dilation of blood vessels

11. Immune System Last line of defense
Lymphatic system, lymph nodes, lymph, lymphocytes
Lymph - fluid containing lymphocytes
Lymphocytes - white blood cells

12. Immunity Active Immunity-body creates antibodies
Through sickness of immunization
Immunization/ vaccine – injected with small amount of pathogen
Passive Immunity-passed from mother to child through birth or breast milk

15. Treatment Antibiotics – kill living organisms
Treat bacterial infections only
Fungus are treated with cream or topical treatment

16. Treatment of Virus Anti-viral can stop a virus from reproducing
Most viruses are fought by our immune system with…
Rest
Proper diet
Water