Zoology - Body Fluids and Circulation Question with Solution | TestHub

During an allergic reaction, there is an increased release of histamines and serotonin from mast cells and basophils. As degranulation occurs, it causes the mast cell or basophil to release a series of chemicals that orchestrate the allergic reaction. Within every mast cell or basophil are 500 to 1500 granules containing more than thirty different allergy-causing chemicals. The best-known chemicals that are released is histamine and serotonin.