Question

which of the following structures of the inner ear converts mechanical vibrations into action potentials? a.) ossicles b.) semicircular canal c.) tympanic membrane d.) organ of corti

Explanation:

• Ossicles: These are small bones (malleus, incus, stapes) in the middle ear. Their function is to transmit sound vibrations from the tympanic membrane to the inner ear, not to convert mechanical vibrations into action potentials.
• Semicircular Canal: Part of the vestibular system in the inner ear. It is involved in balance and detecting rotational movements of the head, not in converting sound - related mechanical vibrations into action potentials.
• Tympanic Membrane: Also known as the eardrum. It is in the middle ear and vibrates in response to sound waves. Its role is to transmit these vibrations to the ossicles, not to convert them into action potentials.
• Organ of Corti: Located in the cochlea (a part of the inner ear). It contains hair cells. When the basilar membrane (where the organ of Corti is located) vibrates (due to mechanical vibrations from sound), the hair cells are bent. This bending leads to the generation of action potentials that are then transmitted to the brain via the auditory nerve.

Answer:

d. Organ of Corti