what does the nose do

The nose is part of the respiratory system and performs several important functions. It allows air to enter the body, filters debris, and warms and moistens the air. The nose also provides a sense of smell and helps shape facial appearance. The nasal cavity removes minute airborne particles and other debris before the air reaches the lower respiratory tract. The nose also functions to facilitate drainage for the secretions from the adjacent sinuses and captures odor-bearing particles and transmits them to the olfactory recesses. The nose is also involved in facial expressions. The external part of the nose consists of the nasal bone, cartilage, and fat, which define the shape of the nose. Health conditions that can affect the nose include a stuffy nose, nosebleed, and sinus infection. If any of the functions of the nasal cavity are compromised, the result is likely to manifest in signs and symptoms of clinically significant disease processes.