Allow the exchange of oxygen and carbo dioxide between the blood and the environment.

Air sacs surrounded by blood vessels.

it is lined with glands that produce mucous and lined with hair-like structure called celia.

two tubes found at the lower end of the trachea.

Found between the nasal cavity and the esophagus.

Aids in drawing oxygen in and expelling carbon dioxide from the body during breathing

Triangular ridge called "Adam's Apple" that contains the vocal cords. It produces sound.

Filter the dust and other particles present in the air.

Act as a passageway for air to the lungs.