A 60-year-old man presents to his primary care physician complaining that he often feels as if the room is spinning when he gets up from a recumbent position or turns his head. He has not lost consciousness and has had no chest pain. He has no cardiac history, and a recent treadmill test showed no abnormalities. On examination, the sensation can be produced by rapidly turning the head. It can be reproduced many times, but it eventually ceases. Nystagmus is elicited. Hearing is normal. Which of the following is the MOST likely mechanism for this patient's symptoms?
AInsufficient cerebral perfusion
BInsufficient cardiac output
CAberrant stimulation of hair cells
DHair cell death in the semicircular canals
What is the function of the tip of the hair cell in utricle?
AVision
BReceptor membrane Depolarization
CHearing
DFormation of perilymph
What is the primary function of the otolith organs?
AProducing the vestibular-ocular reflex
BDetecting the position of the head in space
CProducing rotary nystagmus
DDetecting angular acceleration
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