Immune System
Defense System
Innate immune system
- Skin
- Covers body
- Prevents pathogens from penetrating the body.
- Often preached because of the holes (mouth, nose, etc.)
- Coughing and sneezing is a defense to get rid of the intruder
Adaptive immune system
- White Blood Cells
- Attacks/eats pathogens inside the body
- Works by contact or engulfing
- Roam around in the body until they are called to a certain spot
- Immunological memory (each pathogen is remembered by a signature antigen)
Passive Immune System
- Antibodies
- Tags and neutralizes the pathogens
- Killer T-cells attach and destroy infected cells (suicide cells)
- Helper T-cells call the killer T-cells to destroy
- Antigens are specific substances found in foreign microbes
- When antigens are detected by a macrophage, the T-cells become activated
Immune system- 3 Lines of Defense