Which of the Following Statements About Using Antihistamines in the Treatment

question 22

Multiple Choice

Which of the following statements about using antihistamines in the treatment of anaphylaxis is TRUE?

• A) Antihistamines displace histamine, then block histamine receptors.
• B) Antihistamines block histamine receptors and reduce histamine release from mast cells and basophils.
• C) Blocking of H1 receptors results in mild vasoconstriction, while the blocking of H2 receptors results in bronchodilation.
• D) Antihistamines block H1 and H2 receptors and prevent further release of histamine from B and T cells.

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