The Paranasal Sinuses, Together with Other Structures of the Upper

Multiple Choice

The paranasal sinuses, together with other structures of the upper respiratory tract,

A) are where a small percentage of gas exchange occurs.
B) form part of the respiratory membrane.
C) are involved in filtering, warming, and humidifying incoming air.
D) provide a large area for gas exchange between air and circulating blood.
E) are lined by a delicate simple squamous epithelium.