Final answer:
The correct answer is A. acetylcholine. Acetylcholine is not implicated in the allergic reaction. The main mediators/ initiators of type II hypersensitivity reactions are antibodies. Inflammatory molecules released by mast cells in type I hypersensitivities are characterized by cell lysis (cytotoxicity).
Step-by-step explanation:
The correct answer is A. acetylcholine. Acetylcholine is not implicated in the allergic reaction. The main mediators/ initiators of type II hypersensitivity reactions are antibodies. Inflammatory molecules released by mast cells in type I hypersensitivities are characterized by cell lysis (cytotoxicity). Type III hypersensitivity is induced by the accumulation of immune complexes in tissues and small blood vessels. Histamine is released by mast cells as a result of a reaction to an irritation. The drug used to counteract the effects of anaphylactic shock is epinephrine. Cytokines such as acute-phase proteins, histamine, leukotrienes, prostaglandins, and bradykinin play a key role in the inflammatory response. Histamine binds to the H1 G-protein-linked receptor to initiate the itchiness and airway constriction associated with an allergic response.