Which of the following structures of the ear equalizes pressure between the outer and middle ear?
a. eustachian tube c. semicircular canal
b. fluid-filled cochlea d. tympanic membrane
A
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A Correct. The eustachian tube connects the middle ear with the nasopharynx. It allows fluid to drain into the nasopharynx and equalizes pressure between the outer and middle ear.
B Incorrect. The fluid-filled cochlea does not equalize pressure between the outer and middle ear. The nerve endings in the inner ear are contained in the fluid-filled cochlea which transmits sound waves to the auditory nerve in the brain.
C Incorrect. The semicircular canal in the inner ear maintains balance and body position.
D Incorrect. The tympanic membrane (eardrum) vibrates to conduct sound waves to the 3 bones in the middle ear.
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