The Human Immune System Video

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

Major Components First line of defense—attempts to keep pathogens out Second line of defense---attacks pathogens that have invaded

The First Line of Defense Enzymes in mouth Skin Mucus Stomach acid

The Second Line of Defense ~White Blood Cells~ white blood cells (WBCs) attack invaders WBCs normally circulate throughout the blood, but will enter the body’s tissues if invaders are detected Video

Other Cells of the Immune System Macrophages: engulf and digest microorganisms and viruses T-cells: coordinate immune system and attack infected cells B-Cells: make antibodies (proteins that attach specific antigens)

Other responses Fever: T-cells send chemical signal to turn up temp slows growth of pathogen and increases B and T cells Memory B Cells: can produce B Cells to make enough antibodies in 3-4 days to protect you instead of 2 weeks

Challenges to the Immune System Allergies: overreaction to antigen Autoimmune diseases: a disease which attacks the body’s own cells (rheumatoid arthritis, type 1 diabetes, multiple sclerosis and lupus) Cancer: when cells divide at an uncontrolled rate AIDS/HIV: destroys helper T-cells

Other Systems the Immune System works with Skeletal– bone marrow produces white blood cells Circulatory System—transportation Integumentary system—skin All systems protected by immune system http://ed.ted.com/lessons/cell-vs-virus-a-battle-for-health-shannon-stiles