The deflection of the hair-cell stereocilia opens mechanically gated ion channels that allow any small, positively charged ions (primarily potassium and calcium) to enter the cell. Unlike many other electrically active cells, the hair cell itself does not fire an action potential. Instead, the influx of positive ions from the endolymph in Scala media depolarizes the cell, resulting in a receptor potential. This receptor potential opens voltage gated calcium channels; calcium ions then enter the cell and trigger the release of neurotransmitters at the basal end of the cell.
art beyond the humanities
“The Visual Arts have become increasingly linked to the humanities. This trend is a mistake and that mistake has had consequences deleterious to the seriousness with which the arts are taken.” MARJORIE GARBER Director of the Carpenter Center for the Visual Arts, Harvard University.