___________ play an important role in hypersensitivity.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Basophils
Hypersensitivity (allergy) is an exaggerated response of the immune system to a harmless substance such as pollen, dust or certain foods. Basophils, a kind of white blood cell, carry IgE antibodies on their surface; when the allergen binds to them they release histamine, serotonin and heparin, which cause the swelling, itching, sneezing and narrowing of the airways of an allergic reaction.
Why the other options are incorrect
Option (2) Erythrocytes — Incorrect. These are red blood cells; they carry oxygen and take no part in immune reactions.
Option (3) Neutrophils — Incorrect. The most common white cells; they engulf and destroy bacteria (phagocytosis).
Option (4) Monocytes — Incorrect. Phagocytic white cells that become macrophages in the tissues and clear germs and dead cells.