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| Description: (a) The figure shows the appearance of the cilia of an auditory hair cell. (b) Movement of the bundle of cilia toward the tallest one increases the firing rate of the cochlear nerve axon attached to the hair cell, while movement away from the tallest one decreases it. (c) Movement toward the tallest cilium increases tension on the tip links, which opens the ion channels and increases the influx of K+ and Ca2+ ions. Movement toward the shortest cilium removes tension from the tip links, which permits the ion channels to close, stopping the influx of cations.
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