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प्रश्न
Many people experience allergic symptoms of sneezing or wheezing on exposure to certain substances in the environment. Give two examples of such substances. Which type of antibodies are produced by the body in response to these substances? Mention the role of mast cells in this kind of allergic response.
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उत्तर
The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The antibodies produced to these are of IgE type. Common examples of allergens are mites in dust, pollens, animal dander, etc. Allergy is due to the release of chemicals like histamine and serotonin from the mast cells.
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संबंधित प्रश्न
Match the items given under column I with those given under column II.
| Column A | Column B | ||
| 1 | Dust allergy | a. | Nuts |
| 2 | food allergy | b. | Pollen |
| 3 | Seasonal allergy | c. | Asthma |
What are allergens?
A person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air. Identify the condition. Name the cells responsible for such reactions. What precaution should be taken to avoid such reactions.
Compare the life style of people living in the urban areas with those of rural areas and briefly describe how the life style affects their health.
What is the definition of an allergy?
What can occur in allergic conjunctivitis?
What is anaphylactic shock?
Which situation can trigger an anaphylactic shock reaction similar to injection of a foreign protein?
What happens when histamine is discharged in large quantities during anaphylactic shock?
What facial changes can occur during anaphylactic shock?
