Is the smooth muscle of the respiratory system is controlled by the autonomic nervous system?

Yes, the smooth muscle of the respiratory system is primarily controlled by the autonomic nervous system. The sympathetic division typically causes bronchodilation, relaxing the smooth muscle and widening the airways, while the parasympathetic division induces bronchoconstriction, tightening the smooth muscle and narrowing the airways. This autonomic regulation helps to control airflow and respiratory function in response to various physiological needs.