Nose

 

 

 

The main function of your nose is to bring in warm, humidified, clean air into the lungs. You can also think of it as the front line of our immunologic defense system.  By filtering out particles from the air and using mucous membranes with immunoglobulins, your nose helps stop infectious material from entering your body any further.  By presenting molecules to the olfactory nerve, your nose also gives you the ability to smell.