Chemicals responsible for the dilation and increased permeability of blood vessels in allergic reactions are called
A)histamines.
B)antigens.
C)antibodies.
D)lymphocytes.

Question

Quizplus · Accepted Answer

Histamines are chemicals released by mast cells and basophils during an allergic reaction. They cause dilation and increased permeability of blood vessels, leading to symptoms such as swelling, redness, itching, and hives. Antigens are foreign substances that trigger an immune response, while antibodies are proteins produced by the immune system to neutralize antigens. Lymphocytes are a type of white blood cell involved in the immune response.

Chemicals Responsible for the Dilation and Increased Permeability of Blood