Question

The mast cells secrete which of the following substances?

• A. Heparin
• B. Histamine
• C. Serotonin
• D. All of the above

Answer 1

Answer: (D)

All of the above

Mast cells are scattered throughout the connective tissues of the body and they mediate inflammatory responses such as hypersensitivity and allergic reactions. Mast cells secrete a number of different chemical mediators including heparin, histamine, serotonin, interleukins, proteoglycan (like heparin) and various enzymes in coarse granules found throughout the cytoplasm of cells.
Thus, the correct answer is option D.