The
respiratory system is made of body parts that are in charge of your
breathing. It includes your nose and nasal cavity. You inhale air though
your nose. As you inhale, small specks of dirt are trapped by many tiny
hairs in your nose. This cleans the air. The hairs stop the dirt from
going further in your body. The moist inside surface in your nose traps
even smaller pieces of dirt. The nasal cavity, the air passage behind
the nose, plays an important role in breathing.The nasal cavity is divided into a right and left passageway. The tissue that covers the wall of your nasal cavity contains many blood vessels. Heat from the blood in the vessels helps warm the air as you breath. Moisture is added to the air you breath by special cells in the walls of the nasal cavity. The air is warmed and moistened before it reaches your lungs.