Narrowest pa of airway is:
Subglottis
Carina
At vocal cords
None of the above
The subglottis is the narrowest poion of the airway in children, and the cricoid cailage is the only complete cailaginous ring in the airway. Because airflow in a cylinder is directly propoional to the fouh power of the radius, even a slight reduction in the area of the subglottis can lead to significant obstruction.