31.5 overreactions of the immune system key concept an overactive immune system can make the body...
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31.5 Overreactions of the Immune System
KEY CONCEPTAn overactive immune system can make the body very unhealthy.
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31.5 Overreactions of the Immune System
Allergies occur when the immune system responds to harmless antigens.
• An allergy is a response to a harmless antigen.• Allergies are caused by allergens.
– Allergens are antigens that cause an allergic reaction and cause inflammation responses.
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31.5 Overreactions of the Immune System
• Types of 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.
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31.5 Overreactions of the Immune System
• 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.
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31.5 Overreactions of the Immune System
In autoimmune diseases, white blood cells attack the body’s healthy cells and the immune system fails
Causes:– White blood cells cannot recognize healthy cells.– White blood cells attack healthy body cells.– Tissues fail because of attack.
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31.5 Overreactions of the Immune System
• There are over 60 autoimmune diseases.