1. THE BODY’S DEFENSE AGAINST DISEASE

2. First Line of Defense: PHYSICAL BARRIERS Skin Mucous Membranes
Mucous and Cilia
Chemicals
Sweat - acidic
Vomiting & Diarrhea
Blinking Reflexes & Eyelashes
Tears – protein kills bacteria
Fever

3. Second Line of Defense:
INFLAMMATORY RESPONSE
Inflammation (blood vessels near site expand)
Pain, redness and swelling
Pus – dead and injured body cells
White Blood Cells - made in bone marrow and spleen - helps fight infections
The inflammatory response shows that your body is attacking pathogens

4. 3rd Line of Defense: The IMMUNE SYSTEM
Immune Response - the body makes antibodies when it is infected with a virus - these antibodies kill the virus
Antigen – a substance that can trigger an immune response resulting in production of an antibody.

5. Third Line of Defense: Lymphatic system –
Lymphocyte: specialized white blood that coordinates and performs many functions of specific immunity. (2types) Tcells & B cells
Helper T cells: trigger production of B cell and killer
T cells
Killer T cells: attack and destroy infected body cells.
Suppressor T cells: suppress helper T cells when infection has been cleared.
B cells: product antibodies
Antibody – Protein substance that destroy specific bacteria, viruses or other disease agents that infect the body.
Lymph Nodes - located in high concentrations in neck, armpits and groin areas - helps destroy infection

6. Third Line of Defense: Active Immunity Passive Immunity
Vaccination - the body creates antibodies in a response to dead or weakens viruses injected or taken orally
Passive Immunity
Through pregnancy or nursing

7. PREVENTION WASH YOUR HANDS FREQUENTLY Protect yourself – stay healthy
Eat a healthy, balanced diet
Stay hydrated
Reduce your stress levels - relax
Exercise regularly – 60 minutes aerobic, daily
Get regular medical checkups
Try to avoid close contact with sick people
Get enough sleep
Don’t share personal items
Cover your mouth
Be on guard outdoors
GET VACCINATED