1. Disease

2. Disease
A disruption in the human body that leads to a disruption in homeostasis
Two types:
Non-Infectious and Infectious

3. Non – Infectious CANNOT be transmitted from one organism to another
Ex: genetic disorders, heart disease and most cancers

4. Infectious CAN be transmitted from one organism to another
Ex: Bubonic plague, TB, HIV
Caused by pathogens – anything that can cause disease

5. Pathogens (AKA: Germ)
Include: bacteria, viruses, protists, fungi, and parasitic worms

6. Bacteria
Produce toxins (poisonous chemicals) and destroy body tissues which can disrupt homeostasis
TB (tuberculosis)
Strep Throat
Salmonella
Treated with antibiotics specific to the bacteria

7. Viruses
It is NOT a cell
It is NOT ALIVE – it MUST use a living cell to reproduce – this damages or destroys the living cell
It disrupts homeostasis if the viral infection destroys cells faster than the body can replace them
Ex: HIV
Chicken Pox
Flu

8. Transmission of Pathogens
Air
Infected Organism
Food
Vectors (mosquito)
Water
Animals

9. Preventing Entry Your body can stop pathogens from entering
Skin and mucous membranes form strong barriers
HCL acid in your stomach kills bacteria

10. Avoiding Disease
Good Hygiene – proper hand washing, avoiding contaminated animals and people
Healthy Lifestyle – Eating a balanced diet supplies the body with the nutrients needed and exercise
Get Vaccinated - we will learn about this in a later lesson…

12. Discuss and answer…
Think of one disease mentioned today. Explain how it can disrupt homeostasis in your body.