Allergies occur when the immune system responds to harmless antigens.

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Presentation transcript:

KEY CONCEPT An overactive immune system can make the body very unhealthy.

Allergies occur when the immune system responds to harmless antigens. An allergy is an response to a harmless antigen. Allergies are caused by allergens. Allergens are antigens that cause an allergic reaction. Allergens cause inflammation responses.

There are many different allergens. food, e.g. peanuts, milk, wheat, etc. airborne, e.g. pollen, dust mite feces, mold, etc. chemical, e.g. nickel, medicine, bee stings, etc.

Allergens can cause anaphylaxis. Anaphylaxis is an extreme inflammation response. Blood vessels and airways become too porous. If not treated immediately, anaphylaxis can cause death.

In autoimmune diseases, white blood cells attack the body’s healthy cells. Autoimmune diseases are failures of the immune system. White blood cells cannot recognize healthy cells. White blood cells attack healthy body cells. Tissues fail because of attack.

There are over 60 autoimmune diseases.