What is the function of the auditory canal (meatus)?

• A. A tube that channels sound toward the eardrum
• B. The organ that houses the cochlea
• C. The muscles that move the eardrum
• D. The nerve that transmits sound to the brain

Answer: (A)

The question targets understanding of the external auditory canal’s role in hearing. The auditory canal is the tube that runs from the outer ear opening to the eardrum, and its main job is to channel sound waves toward the eardrum, guiding vibrations from the outside world into the middle ear. Its shape also helps resonate certain frequencies, which can enhance sounds important for understanding speech. The canal is lined with hairs and earwax (cerumen) to protect the eardrum from debris.

Think of the other options as referring to different parts of the auditory system: the cochlea is in the inner ear and houses the sensory cells for hearing; the muscles that move the eardrum are in the middle ear (they don’t reside in the canal); and the nerve that transmits sound to the brain is the auditory nerve, not the canal.