Question

Histamine secreting cells are found in

• A. connective tissues
• B. lungs
• C. muscular tissue
• D. nervous tissue.

Answer 1

The Correct Option is A

Histamine is an organic nitrogenous compound involved in local immune responses and functions as a neurotransmitter. It is commonly known for its role in allergic reactions. Histamine-secreting cells are primarily found in:

1. Connective Tissues: Histamine is stored and released by mast cells, which are a type of white blood cells located in connective tissues, primarily in the skin, lungs, and digestive system. These cells release histamine as part of the body's immune response to allergens.
2. Lungs: While histamine-releasing cells can be found in the lungs, the primary location for mast cells is still the connective tissues within and around lung structures rather than the lung tissues themselves.
3. Muscular Tissue: Muscles do not typically contain cells that release histamine in significant amounts. The primary action of histamine in affecting muscles is through its role in causing smooth muscle contraction, like bronchoconstriction, but this does not imply a direct presence of histamine-secreting cells in muscular tissues.
4. Nervous Tissue: While histamine acts as a neurotransmitter in the brain, the actual synthesis and release within nervous tissue are not primarily associated with mast cells or similar cells found in connective tissues.

Conclusion: Therefore, the correct option is connective tissues as histamine-secreting mast cells are predominantly found there. These cells play a crucial role in immune response and allergy symptoms.