Allergy — Chapter Summary
ICSE · Class 7 · Biology
Summary of Allergy for ICSE Class 7 Biology. Key concepts: Allergy is a hypersensitive, An allergen is any substance and These proteins are produced by.
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Overview
Allergy is a special reaction of the immune system to a substance that usually does not harm most people. The substance that causes the reaction is called an allergen. Common allergic diseases include hay fever, dermatitis, asthma, and food allergies. During an allergy, the body produces immunoglobu
Key Concepts
Allergy is a hypersensitive reaction
Allergy is a hypersensitive reaction of the immune system to a normally harmless substance. The concept was introduced in 1906 by Clemens Von Pirquet.
An allergen is any substance
An allergen is any substance that causes allergy. Common allergens include dust, spores, pollen, insect stings, certain clothes, food, and some medici
These proteins are produced by
These proteins are produced by the immune system and are specific to an allergen. They bind to the allergen and then to white blood cells.
Histamine is an inflammatory chemical released
Histamine is an inflammatory chemical released after immunoglobulin proteins bind to the allergen and then to white blood cells. It causes symptoms li
Allergens commonly enter the body through
Allergens commonly enter the body through the skin, mouth, and nose. Skin contact may occur with latex, clothes, or insect bites. Food enters through
Learning Objectives
- Define allergy and allergen.
- Identify common allergens and their entry routes through the skin, mouth, and nose.
- Describe the role of immunoglobulin proteins and histamine in allergic reactions.
- Recognize common allergic reactions such as hay fever, asthma, hives, and anaphylaxis.
- Understand the main methods used to diagnose allergy.
Frequently Asked Questions
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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