Nose is the smell receptors or olfactory organs. Nose has two holes called Nostrils. The nostrils and nasal passage is separated by septum made of cartilage. There is a space in the middle of our face called nasal cavity which connect to the back of the throat which in turn connects trachea. When we inhale air, membrane warms and moistens it. mucous traps dust, gems and other particles. Cilia are the name given to small hairs in your nose. An olfactory epithelium is situated on the roof of mouth has very small receptors which are sensitive to odour molecules. odour stimulate different receptor and olfactory nerve sends message to brain and it interprets different smells.