Perception of Gravity and Linear Acceleration Depends On

Question

Perception of gravity and linear acceleration depends on
A) changes in the pressure exerted by the ampullary cupula on hair cells.
B) vibrations of the tectorial membrane striking hair cells.
C) the force exerted by otoliths on hair cells of the maculae.
D) the movement of endolymph within the semicircular canals.
E) the bending of hair cells in the ampullae.

Accepted Answer

The force exerted by otoliths on hair cells of the maculae is responsible for the perception of gravity and linear acceleration. The otoliths are small crystals of calcium carbonate that move in response to changes in head position, causing a bending of hair cells in the maculae of the utricle and saccule. This bending triggers the firing of action potentials along the vestibular nerve, which sends signals to the brain about changes in head position and movement. Therefore, the correct choice is C.