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Under normal circumstances, bronchoconstriction is caused by ________________ and bronchodilation is caused by ________________. A. Sympathetic...

Under normal circumstances, bronchoconstriction is caused by ________________ and bronchodilation is caused by ________________.

  • A. Sympathetic nervous system; parasympathetic nervous system

  • B. Parasympathetic nervous system; sympathetic nervous system

  • C. Voluntary control; involuntary control

  • D. Involuntary control; voluntary control

  • E. None of the above

Science   Anatomy-And-Physiology   
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Answer #1

B. Parasympathetic nervous system ; sympathetic nervous system

  • Bronchus list lined by smooth muscles and therefore they are under autonomic control and are not controlled voluntarily
  • Parasympathetic causes bronchoconstriction
  • Sympathetic causes bronchodilation.
  • Therefore to treat asthma and other disease in which there is bronchoconstriction, we give parasymptheolytic drugs (like anticholinergic and beta blocker) which reverse effect of parasympathetic and thus cause bronchodilation
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