Disease

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

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

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

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

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

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

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

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

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…

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