Is Bronchial Dilation Sympathetic or Parasympathetic

Dilation and constriction of the airway are achieved through nervous control by the parasympathetic and sympathetic nervous systems. The parasympathetic system causes bronchoconstriction, whereas the sympathetic nervous system stimulates bronchodilation.

Is bronchodilation parasympathetic or sympathetic?

The parasympathetic system causes bronchoconstriction, whereas the sympathetic nervous system stimulates bronchodilation.

Does parasympathetic relax bronchi?

The parasympathetic nervous system is the most important determinant of bronchomotor tone and when activated can completely obliterate the lumen of small airways. Both afferent and efferent nerve fibers travel via the vagus nerve (X) with efferent ganglia in the bronchial walls.