The olfactory receptors for the sense of smell are located in the mucosa in the slitlike superior part of the nasal cavity, just beneath the ethmoid bone. The interior of the nose consists of the nasal cavity, divided by a midline nasal septum.
Nostrils. During breathing, air enters the nose by passing through the nostrils, or nares.The nose is the only externally visible part of the respiratory system.
The organs of the respiratory system include the nose, pharynx, larynx, trachea, bronchi, and their smaller branches, and the lungs, which contain the alveoli. Humidifier. Purify, humidify, and warm incoming air.Passageway. Passageways that allow air to reach the lungs.Gas exchange. The respiratory system organs oversee the gas exchanges that occur between the blood and the external environment.Elimination. Elimination of carbon dioxide.Oxygen supplier. The job of the respiratory system is to keep the body constantly supplied with oxygen.
The functions of the respiratory system are: