Question

During an allergic immune response, histamine is released from:

• A. Mast cells
• B. T lymphocytes
• C. B lymphocytes
• D. Special lymphocytes that also secrete IgE

Answer 1

The Correct Option is A

Step 1: Understanding histamine release in allergic reactions. - Mast cells are immune cells that play a key role in allergic responses. - When allergens bind to IgE antibodies on mast cells, they release histamine, causing inflammation and allergy symptoms. 

Step 2: Explanation of incorrect options. 
- T lymphocytes (B): Involved in cell-mediated immunity, not histamine release. 
- B lymphocytes (C): Produce antibodies, but do not store or release histamine. 
- Special lymphocytes secreting IgE (D): Plasma cells produce IgE, but histamine release occurs from mast cells. 

Step 3: Selecting the correct option. Since mast cells release histamine in response to allergens, the correct answer is (A) Mast cells.