Low K+ concentration in the perilymph prevents the K+ gates from transmitting current, depolarizing the hair cell.
Stereocilia and the cell bodies of hair follicles are encircled by endolymph, which is analogous to intracellular fluid. It contains more K+ than Na+, but more K+ than Na+. The K+ equilibrium potential is 0 mV because to the high K+ concentration. As a result, hair cells depolarize and move toward the equilibrium potential of K+, which is 0 mV, when K+ channels open. In contrast, neurons hyperpolarize when K+ channels open because they have a K+ equilibrium potential of -80 mV. Perilymph has an ionic composition that is low in K+ and high in Na+, comparable to that of CSF. The stereocilia and hair cell bodies won't depolarize when K+ channels open if perilymph is present around them.
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