In an allergic reaction, the chemicals that are responsible for dilating blood vessels, increasing mucous secretion, and swelling of tissues are
A) histamines.
B) antigens.
C) antibodies.
D) hormones.

Question

Quizplus · Accepted Answer

Histamines are the chemicals responsible for the symptoms of an allergic reaction, including dilation of blood vessels, increased mucous secretion, and swelling of tissues. Antigens are the foreign substances that trigger an immune response, antibodies are produced by the immune system to specifically target and neutralize antigens, and hormones are chemical messengers produced by glands in the body to regulate various bodily functions.

In an Allergic Reaction, the Chemicals That Are Responsible for Dilating