What is the role of the Eustachian tube?

The role of the Eustachian tube is primarily to ventilate the middle ear and drain fluids. It connects the middle ear to the nasopharynx, helping to equalize pressure between the middle ear and the external environment. This function is essential because it allows the middle ear to operate effectively, particularly when changes in atmospheric pressure occur, such as during altitude changes or when swallowing.

Additionally, the Eustachian tube assists in draining any accumulated fluids from the middle ear into the throat, which is crucial for preventing infections and maintaining overall ear health. Without proper ventilation and drainage provided by the Eustachian tube, issues such as fluid buildup, pressure imbalance, and ear infections can occur.

Other functions mentioned in the answer choices, such as transmitting sound waves or absorbing sound, are not roles associated with the Eustachian tube. Instead, these functions are related to the structures within the inner and outer ear, highlighting the specific and vital role the Eustachian tube plays in maintaining ear health and function.