Histamine Receptors Quiz
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Questions and Answers

Which histamine receptor is important in producing smooth muscle contraction?

  • H1 receptor (correct)
  • H4 receptor
  • H2 receptor
  • H3 receptor
  • What effect does histamine have on small blood vessels?

  • Vasoconstriction
  • Increased clotting
  • No effect
  • Vasodilation (correct)
  • Which receptor mediates many pathological processes including allergic rhinitis and asthma?

  • H4 receptor
  • H3 receptor
  • H1 receptor (correct)
  • H2 receptor
  • What does histamine cause the vascular endothelium to release, leading to vasodilation?

    <p>Nitric oxide</p> Signup and view all the answers

    Which receptor is targeted by clinically useful drugs?

    <p>H1 and H2 receptors</p> Signup and view all the answers

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