By permitting potassium ions to pass over the membrane and into the cell, the bending of a tip link protein causes depolarization of the hair cell.
As the membrane is pressed against the hair cell stereocilia, they tilt in the direction of the highest one. The other tip links are pulled as the higher stereocilium flexes. The next shorter stereocilium's ion gate is attached to the tip link, which pulls the gate open to let K+ ions enter the cell and depolarize it.
Stereocilia on both inner and outer hair cells will flex in response to basilar membrane movement.
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