Biology 30 – Nervous And Endocrine System Practice Test

Which structure is the primary receptor for auditory information within the cochlea?

Organ of Corti Cochlea Ossicles Tympanic membrane

Correct Answer:

Organ of Corti

Explanation:

Auditory information is captured by hair cells, the sensory receptors located on the Organ of Corti inside the cochlea. When sound vibrations move the fluid in the cochlea, the basilar membrane vibrates and the hair bundles on these hair cells bend as they interact with the tectorial membrane. This mechanical bending opens ion channels, creating receptor potentials and triggering neurotransmitter release to the auditory nerve. The Organ of Corti is the specific site where this transduction happens, making it the primary receptor within the cochlea. The broader cochlea is the structure that houses the organ, while the middle ear ossicles and the tympanic membrane are involved in transmitting and amplifying sound, not in transducing it.

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