Question at position 11 When sound waves enter the ear canal, they firstmove the stirrupvibrate the hammervibrate the eardrumvibrate the cochleamove the oval window

Question

BlackTom AI · Accepted Answer

When sound waves reach the ear, they interact with several parts in sequence and we can evaluate each option in turn.
Option 1: move the stirrup (stapes). This occurs after the tympanic membrane vibrates and the middle-ear bones transmit vibration; it is not the initial response to sound.
Option 2: vibrate the hammer (malleus). Like the stapes, the malleus moves as part of the chain of ossicles once the eardrum has been set into motion; this is a downstream step rather than the first event.
Option 3: vibrate the eardrum. The tympanic membrane is the first structure in the middle ear to respond to incoming sound pressure; its vibration converts air pressure waves into mechanical energy that drives the rest of the chain.
Option 4: vibrate the cochlea. The cochlea is part of the inner ear and responds after the ossicles transmit energy to the oval window; activation of the cochlea is a later step in the pathway.
Option 5: move the oval window. The oval window moves as the stapes pushes on it, but this occurs after the eardrum has vibrated and after the ossicles have transmitted energy; it is not the initial event.
Overall, the pattern follows the sequence from outer to inner ear: sound waves cause the eardrum to vibrate, which then leads to movement of the ossicles, the oval window, and finally cochlear motion. The option describing the first mechanical response in this sequence is the vibration of the eardrum.

Question at position 11 When sound waves enter the ear canal, they firstmove the stirrupvibrate the hammervibrate the eardrumvibrate the cochleamove the oval window单项选择题

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