With rare exceptions like the oral polio vaccine and intranasal vaccines against influenza, the majority of immunizations are ...

For one, the nasal cavity possesses a dense vascular network ... turbulent flow to be distributed to the moist nasal respiratory mucosa that lies beyond. The total surface area of this mucosa ...

The air that enters the nasal cavity flows down the trachea ... Parts of the model represent different parts of the respiratory system as shown here. The model, which is air tight, represents ...