<prompt> During inspiration the main current of air flow in a normal nasal cavity is through:Middle part of the cavity in a parabolic curveLower part of the cavity in a parabolic curveSuperior part of the cavity in a parabolic curveThrough olfactory area  <response>: a Middle part of the cavity in a parabolic curveRef. Cummings, 6th ed., 626The main current of airflow passes through the middle part of the nose in a parabolic curve both during inspiration and expiration. 