Mon Prof Augmenté
Allergy Response
Age 14 · Biology
The immune system mistakes a harmless substance, such as pollen, for a dangerous invader. Antibodies on a white blood cell trigger the release of histamine, which makes nearby tissue swell and itch.
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In the picture
- Pollen grain: harmless substance touching the white blood cell.
- Y-shaped antibody on the white blood cell: recognizes the pollen grain.
- Histamine granules: small packets released by the white blood cell.
- Swollen capillary wall: fluid leaking into nearby tissue.
Examples
- Pollen causing sneezing and itchy eyes
- Peanut protein causing hives
Key takeaways
- Allergies are immune reactions to harmless substances.
- Histamine causes swelling, itching, and leaking fluid.
Quiz: Allergy Response (Age 14)
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In an allergic reaction, what does the immune system mistake?
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What do antibodies on a white blood cell do when they recognize a pollen grain?
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What does histamine cause in nearby tissue?
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