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Physiology · Sensory physiology
Sample itemWhich skin receptor is rapidly adapting and best detects vibration?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Pacinian corpuscle
Pacinian corpuscles are large, rapidly adapting mechanoreceptors in deep skin that detect vibration and pressure changes. Merkel discs and Ruffini endings adapt slowly and signal sustained pressure and stretch. Free nerve endings mediate pain and temperature.
Option by option
A. Ruffini ending
Ruffini endings are slowly adapting and detect skin stretch.
B. Pacinian corpuscle (correct)
Correct. Its onion-like layers filter out sustained pressure, so it signals vibration.
C. Merkel disc
Merkel discs are slowly adapting and detect fine touch and edges.
D. Free nerve ending
Free nerve endings carry pain and temperature, not vibration.
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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