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C. Auditory hair cell

endolymph has 1SC mM K+

perilymph has 7 mM K+

afferent neuron to the brain sterocilia with potassium channels that depolarize when open endolymph has 1SC mM K+

perilymph has 7 mM K+

Information about sound intensity is reflected in both the firing rate of individual neurons and the total number of active neurons. Loud sound waves cause large deflections of appropriate portions of the basilar membrane. This produces correspondingly large numbers of action potentials in individual hair cells within that region, theoretically causing each hair cell to fire once in response to each sound wave that passes. Large deflections also impinge on surrounding regions of the basilar membrane and can depolarize adjacent hair cells to a lesser extent.

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