Constriction of bronchial smooth muscle can result from
A
Stimulation of vagus nerve
B
Cold stimulus to bronchial mucosa
C
A decrease in PC02 in bronchial air
D
Irritation of bronchial mucosa
E
Stimulation of local beta adrenoceptors
Correct Answer: Stimulation of vagus nerve, Cold stimulus to bronchial mucosa, A decrease in PC02 in bronchial air, Irritation of bronchial mucosa