1. The Human Immune System

2. When the Castle is Under Attack The Immune System Responds!

3. What is the immune system?
The body’s defense against disease-causing organisms, malfunctioning cells, and foreign particles

4. Organs/Tissues/Cells of the Immune System
Spleen
Thymus
Bone Marrow
Tonsils
Lymph Nodes
Lymphocytes

5. Disease
Any change (other than injury) that disrupts the normal function of the body
Pathogen is a disease-causing agent
Can be bacteria, viruses, fungi, protists, worms

6. Do not write, just listen
Pathogen - Virus
Insert their RNA or DNA into host cells
Can infect plants, animals, and bacteria
Small Pox
Warts
Do not write, just listen
Bacteriophage

7. Do not write, just listen
Pathogen - Bacteria
Can break down tissues or release toxins that harm the body
clostridium botulinum
Botulism
Do not write, just listen

8. Do not write, just listen
Pathogen - Fungus
Fungi penetrate the outer layers of skin
Can infect the mouth, throat, nails
Do not write, just listen

9. How Are Diseases Spread?
Infected animals
Physical Contact
Contaminated Food and Drink

10. Non-Specific vs Specific Defenses
Non-specific defenses do not discriminate between one threat and another
Specific defenses have “memory” of the pathogen and gives us immunity to certain diseases

11. How does the body defend against disease?
(Innate) 1st Line of Defense - Prevent Entry
(Innate) 2nd Line of Defense - Search and destroy
(Acquired) 3rd Line of Defense - Immunity

12. Stop Here