The easiest way to think of this is as a passage, that makes sure food and drink go down the oesophagus. And air goes up and down the trachea. There are 3 main parts to the pharynx. They are the: ...

The air that enters the nasal cavity flows down the trachea. The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and ...