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What effect will decreased parasympathetic tone have on the segmental bronchi? a) broncho-dilation b) mixed broncho-constriction...

What effect will decreased parasympathetic tone have on the segmental bronchi?

a) broncho-dilation

b) mixed broncho-constriction and broncho-dilation

c)no effect at all

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

A. Bronchodilation

  • Activation of parasympathc system leads to constraction of smooth muscle of bronchi, which leads to bronchoconstriction. Therefore decreases in parasympathic supply will lead to broncho dilation
  • Activation of sympthetic system causes bronchodilation.
  • That's why in asthma, parasymptholytic drug of sympthomimetic drugs are used.

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