Bronchial smooth muscle relaxation and vascular smooth muscle constriction are caused by the direct actions of which system?

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Biology

Shasta

7 December, 06:55

Bronchial smooth muscle relaxation and vascular smooth muscle constriction are caused by the direct actions of which system?

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Ace Church · Answer 1

Smooth muscle is present throughout the entire tracheobronchial tree. Bronchial smooth muscle tone is regulated by the vagus nerve, which, when stimulated, causes constriction (bronchospasm), and by the sympathetic nervous system, which produces dilation (bronchodilation).