Zoology - Human Health and Diseases Question with Solution | TestHub

Histamine is a chemical that is produced by the immune system to cause symptoms of allergy and does not reduce it. This is because when a person is allergic to a particular food substance or dust etc, the immune system sees them as a threat and in an attempt to protect it prompts the body cells to release histamine and other chemicals into the bloodstream. The histamine then acts on various organs such as eyes, nose, lungs, throat, skin etc.