it makes particles that flow through the air and through your ear, it turns them in to vibrations as sound if your spoken to
The elastic cartilage
The Eustachian tube connects the back of the nose to the middle ear. It is a small tube that is only three to four centimeters long.
The Eustachian tubes connect to the frog's middle ear and aids in equalizing pressure while the frog is swimming. The tube opening in located in the back of the frog's mouth.
The Eustachian tube connects the middle ear cavity to the nasopharynx. It aerates the middle ear system into the nasopharynx. Normal opening of the Eustachian tube equalizes atmospheric pressure in the middle ear, closing of the tube protects the middle ear from unwanted pressure fluctuations and loud sounds