Question

Give an account on hypersensitivity or allergic reaction.

Answer 1

Hypersensitivity or an allergic reaction :

1. Certain antigens present in the environment cause intensifying responses of the immune system.
2. These responses are called allergies or allergic reactions.
3. The substances that produce immune responses are called allergens.
4. Antibodies are produced by these allergens.
5. Common allergens in the environment are dust, pollen grains, drugs, etc. Anti-histamines reduce the symptoms of allergy.
6. Allergy is due to the release of chemicals like histamines and serotonin.