Question at position 13 Which structure(s) of the ear is(are) responsible for detecting changes in the position of the head?stapescochleaeardrumsemicircular canalsClear my selection单项选择题
A
stapes
B
cochlea
C
eardrum
D
semicircular canals

Question

Question at position 13 Which structure(s) of the ear is(are) responsible for detecting changes in the position of the head?stapescochleaeardrumsemicircular canalsClear my selection

BlackTom AI · Accepted Answer

Semicircular canals detect angular (rotational) movements of the head by sensing changes in head position and motion.

1. Relevant knowledge points and concepts
- The vestibular apparatus in the inner ear provides information about balance and head movement. It comprises three semicircular canals and the otolith organs (utricle and saccule).
- Semicircular canals are oriented roughly at right angles to one another and detect angular acceleration (rotation) of the head.
- The otolith organs detect linear acceleration and static head position relative to gravity.
- Structures like the cochlea, stapes, and eardrum are primarily involved in hearing, not in detecting head position changes.

2. Step-by-step reasoning process
- Identify which structures listed are part of the vestibular system: semicircular canals are; stapes, cochlea, and eardrum belong to the auditory apparatus (though stapes is an ossicle that transmits sound to the inner ear).
- Determine the function: semicircular canals detect rotational changes (changes in head position/orientation during movement). Because they are arranged in three planes, they sense pitch, yaw, and roll.
- Note that otolith organs (not listed) would handle linear changes and static tilt, but among the provided choices the semicircular canals are the only ones that sense head movement/position change.

3. Calculations/intermediate steps
- No numerical calculations are required. The logical elimination above serves as the complete reasoning.

4. Why the correct answer is correct
- Movement of endolymph within the semicircular canals during rotation deflects the cupula and stereocilia of hair cells, creating nerve signals indicating head rotation. This mechanism directly detects changes in head position and motion.

5. Why the other options are incorrect
- Stapes: a middle-ear bone that transmits sound vibrations to the inner ear; not a balance receptor.
- Cochlea: the inner-ear organ responsible for converting sound vibrations into neural signals (hearing), not head-position detection.
- Eardrum (tympanic membrane): vibrates in response to sound, transmitting to ossicles; not involved in sensing head movement.

6. Conclusion and confirmation
Therefore, the correct answer is semicircular canals, matching the provided answer.

Question at position 13 Which structure(s) of the ear is(are) responsible for detecting changes in the position of the head?stapescochleaeardrumsemicircular canalsClear my selection单项选择题

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