What happens during sound transmission in the auditory system?

What happens during sound transmission in the auditory system?

• A. Air pressure causes tympanic membrane vibration, which is amplified by ossicles and transmitted to the cochlea.
• B. Sound travels through bone conduction directly to the cochlea bypassing middle ear.
• C. The cochlea vibrates first, producing air pressure changes in the middle ear.
• D. Sound is converted to chemical signals in the cochlea first.

Answer: (A)

Sound is carried by airborne pressure waves that first cause the tympanic membrane to vibrate. That vibration is then transmitted through the small middle-ear bones—the ossicles—which act as an impedance-matching lever to amplify the force and push the movement to the cochlea via the oval window. This sequence, from air pressure to tympanic membrane motion, through the ossicles, and into the fluid-filled cochlea, is how normal sound transmission proceeds. The cochlea itself does not originate the vibration and the primary conversion to neural signals happens in hair cells after the mechanical input reaches them. Bone-conduction is a different pathway that can occur in special cases, but it is not the standard route.

Sound is carried by airborne pressure waves that first cause the tympanic membrane to vibrate. That vibration is then transmitted through the small middle-ear bones—the ossicles—which act as an impedance-matching lever to amplify the force and push the movement to the cochlea via the oval window. This sequence, from air pressure to tympanic membrane motion, through the ossicles, and into the fluid-filled cochlea, is how normal sound transmission proceeds. The cochlea itself does not originate the vibration and the primary conversion to neural signals happens in hair cells after the mechanical input reaches them. Bone-conduction is a different pathway that can occur in special cases, but it is not the standard route.