Which of the following is a vascular effect of histamine released from mast cells?
A)Platelet adhesion
B)Initiation of the clotting cascade
C)Vasodilation
D)Increased endothelial adhesiveness

Question

Quizplus · Accepted Answer

C2b affects smooth muscle, causing vasodilation and increased vascular permeability.
C3a, C5a, and to a limited extent C4a, are anaphylatoxins, that is, they induce rapid mast cell degranulation (release of granular contents) and the release of histamine causing vasodilation and increased capillary permeability.

Which of the Following Is a Vascular Effect of Histamine