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Home Q & A Board Biology-Related Homework Help Medicine
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srueter srueter
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6 years ago
A nurse is teaching a group of nursing students about antihistamines. Which statement by a student indicates an understanding of the mechanism of action of the antihistamines?
 
  a. Antihistamines block H1 receptors to prevent actions of histamine at these sites.
  b. Antihistamines block release of histamine from mast cells and basophils.
  c. H1 antagonists can bind to H1 receptors, H2 receptors, and muscarinic receptors.
  d. First-generation antihistamines are more selective than second-generation antihistamines.
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#1
6 years ago
ANS: A
Antihistamines block H1 receptors to prevent the actions of histamine. They do not block the release of histamine. H1 antagonists do not bind to H2 receptors; they do bind to muscarinic receptors. Second-generation antihistamines are more selective than first-generation antihistamines.
srueter Author
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#2
6 years ago
Thank you for answering
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