Antihistamine Treatment Reduces

Question

Antihistamine treatment reduces
A) blood vessel dilation.
B) phagocytosis of antigens.
C) MHC presentation by macrophages.
D) the secondary immune response.
E) clonal selection by antigens.

Accepted Answer

Antihistamines work by blocking the action of histamines on histamine receptors. Histamines are released during an allergic reaction and cause blood vessel dilation, swelling, and inflammation. By blocking the action of histamines, antihistamines can reduce blood vessel dilation and other symptoms associated with allergies.