Final answer:
Smooth muscle dominates the walls of bronchioles and its activity is regulated by the autonomic nervous system. Reflexes such as coughing and the regulation of oxygen and carbon dioxide levels also result from this autonomic nervous system control.
Step-by-step explanation:
The walls of bronchioles are dominated by smooth muscle, whose activity is regulated by the autonomic nervous system.
The parasympathetic system causes bronchoconstriction, while the sympathetic system stimulates bronchodilation.
Reflexes such as coughing and the regulation of oxygen and carbon dioxide levels also result from this autonomic nervous system control.