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Physiology · Special senses: hearing
Sample itemA factory worker with long-standing noise exposure loses high-frequency hearing first. Which part of the cochlea is most affected?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Basal turn near the oval window
The basilar membrane is narrow and stiff at the base and wide and floppy at the apex. High frequencies therefore peak near the base, and low frequencies near the apex. Hair cells of the basal turn are the first to be damaged by loud noise.
Option by option
A. Basal turn near the oval window (correct)
Correct. High-frequency sounds peak at the base, where the hair cells are most vulnerable to noise.
B. Maculae of the utricle
The utricular macula senses linear acceleration and head tilt, not sound.
C. Apical turn near the helicotrema
The apex responds best to low frequencies and is affected later.
D. Reissner's membrane
Reissner's membrane separates the scala vestibuli from the cochlear duct and does not transduce sound.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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