Allergy
Definition
An allergy is an exaggerated immune response to a substance that is typically harmless, known as an allergen. This response can cause symptoms ranging from mild irritation to severe reactions like anaphylaxis.
5 Must Know Facts For Your Next Test
- Allergens can include pollen, pet dander, food, insect stings, and medications.
- The immune system produces Immunoglobulin E (IgE) antibodies when it encounters an allergen.
- Histamine release by mast cells during an allergic reaction leads to symptoms such as itching, swelling, and redness.
- Common allergic conditions include hay fever, asthma, eczema, and food allergies.
- Anaphylaxis is a severe allergic reaction that can be life-threatening and requires immediate medical attention.
Review Questions
- What types of substances commonly act as allergens?
- Which antibody is primarily involved in allergic reactions?
- What are the typical symptoms caused by the release of histamine during an allergic reaction?
"Allergy" appears in:
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Related terms
Immunoglobulin E (IgE): A type of antibody that plays a crucial role in the body's allergic response.
Histamine: A compound released by mast cells that causes many of the symptoms associated with allergies.
Anaphylaxis: A severe, potentially life-threatening allergic reaction requiring immediate medical intervention.
