<prompt> Narrowest pa of airway is:SubglottisCarinaAt vocal cordsNone of the above  <response>: 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. 