And air goes up and down the trachea. There are 3 main parts to the pharynx. They are the: nasopharynx, which connects the back of the nose to the back of the mouth oropharynx, which is at the back of ...

Parts of the model represent different parts ... and air is only able to enter via the glass tube which represents the trachea. As the rubber sheet is pulled down the volume of the jar increases ...