Q.33 Allergies are due to a hyper immune response. Drugs given to counter allergies target
(A)Glycine
(B) Histamine
(C) Insulin
(D)Cellulose
Allergies stem from an overactive immune response where the body releases histamine, causing symptoms like itching and swelling. Antihistamine drugs effectively counter this by blocking histamine receptors. The correct answer to the query is (B) Histamine.
Correct Answer
Drugs given to counter allergies primarily target histamine. Antihistamines like cetirizine and loratadine block H1 receptors, reducing symptoms such as sneezing, runny nose, and hives triggered by histamine release from mast cells during allergic reactions.
Option Explanations
| Option | Explanation |
|---|---|
| (A) Glycine | Glycine acts as an inhibitory neurotransmitter in the central nervous system, unrelated to allergy pathways or immune responses. |
| (B) Histamine | Correct. Histamine causes allergy symptoms via H1 receptor activation; antihistamines competitively inhibit it to provide relief. |
| (C) Insulin | Insulin regulates blood glucose levels and has no role in allergic immune responses or symptom mediation. |
| (D) Cellulose | Cellulose is a plant fiber used as a dietary supplement or laxative, not involved in human immune or allergy mechanisms. |
This MCQ tests understanding of allergy pathophysiology, common in biology and medical entrance exams.
