What does a pharynx contribute when a human is singing?
Pharynx is another word for opening or space, and it contributes to the resonance of the voice. There is a laryngeal pharynx, or space behind your larynx. There is also an opening or space behind your mouth, the oral pharynx, and another behind your nose, the nasal pharynx. All three of these contribute to the resonance of your voice by enhancing the vibrations of the vocal cords to create overtones as well as the fundamental pitch. You can affect the degree to which the different resonators participate in the tone by the way you shape your entire vocal tract and face.