Paper I
2024 December (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

Norepinephrine lacks the following action:

  • a) Bronchodilatation
  • b) Intestinal relaxation
  • c) Reduced blood flow to kidney
  • d) Rise in blood pressure
Qi1 marksMCQs

Answer

Correct answer: a) Bronchodilatation

Norepinephrine has negligible beta-2 receptor activity (unlike epinephrine), and bronchodilation is a beta-2-mediated action — hence lacking with norepinephrine. Its predominant alpha-1 action still produces vasoconstriction, reduced renal blood flow, and a rise in blood pressure.

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