Question

Pressure is maintained on two sides of ear drum by

• A. Auditory ossicles
• B. Membranous labyrinth
• C. Eustachian tube
• D. Cochlea

Answer 1

The correct option is C Eustachian tube

Eustachian tube connects middle ear with the pharynx. It maintains pressure between middle ear and atmosphere and thus, equalizes pressure on two sides of ear drum. Eustachian tube is closed for most of the time and opens during certain activities like chewing, swallowing so that the air can pass between middle ear and pharynx. When there is a change in atmospheric pressure, a sudden feeling of blockage is observed and these activities can lead to opening of eustachian tube so that the pressure can be equalized within the middle ear.

So, the correct answer is 'Eustachian tube'.