Respiratory system facilitates the exchange of gases between the air we breathe and our blood
1. Air containing oxygen from the atmosphere enters the body
2. Air passes through the nasal cavities and is warmed, moistened and filtered
3. Air passes through the pharynx, larynx and trachea
4. Trachea divides into bronchi that lead to the lungs
5. Air reaches the alveoli where gas exchange occurs