Question at position 44 In the auditory system, the ________ or tympanic membrane separates the outer ear from the middle ear and vibrates in response to sound.eardrumoval windowhammercochlea单项选择题
A
eardrum
B
oval window
C
hammer
D
cochlea

Question

Question at position 44 In the auditory system, the ________ or tympanic membrane separates the outer ear from the middle ear and vibrates in response to sound.eardrumoval windowhammercochlea

BlackTom AI · Accepted Answer

Question restatement: In the auditory system, the ________ or tympanic membrane separates the outer ear from the middle ear and vibrates in response to sound. Options: eardrum, oval window, hammer, cochlea

Option 1: eardrum. This is the tympanic membrane itself, which forms the boundary between the outer ear and the middle ear and plays the key role of vibrating when struck by sound waves. This description matches the prompt precisely.

Option 2: oval window. The oval window is a membrane-covered opening that leads from the middle ear to the inner ear. It is the interface through which the stapes transmits vibrations to the cochlear fluids, not the boundary between the outer and middle ears. Hence, it does not fit the given description.

Option 3: hammer. The hammer, or malleus, is one of the auditory ossicles inside the middle ear. It functions to transmit and amplify vibrations from the eardrum to the anvil (incus) and then to the stapes, but it is not the tympanic membrane itself nor the boundary between outer and middle ears.

Option 4: cochlea. The cochlea is a snail-shaped structure in the inner ear responsible for converting mechanical vibrations into neural signals. It lies beyond the middle ear and does not describe the tympanic membrane or its boundary role.

Summary: Only the first option correctly identifies the tympanic membrane that separates the outer from the middle ear and vibrates in response to sound, aligning with the definition provided in the question.

Question at position 44 In the auditory system, the ________ or tympanic membrane separates the outer ear from the middle ear and vibrates in response to sound.eardrumoval windowhammercochlea单项选择题

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