During which of the following do some of the hair cells in the cochlea of the in
ID: 73315 • Letter: D
Question
During which of the following do some of the hair cells in the cochlea of the inner ear DEpolarize?
A) When neurotransmitter is released into the synaptic cleft at its base and diffuses to the afferent neuron.
B) During the downward motion of the vibrating basilar membrane, relative to the tectorial membrane, when stereo cilia bend against the tectorial membrane in a new direction; resulting in a net flow of Na+ ions out of the cell.
C) During the upward motion of the vibrating basilar membrane, relative to the tectorial membrane, when the stereocilia bend against the tectorial membrane in a new direction; resulting in a net flow of K+ ions into the cell.
D) Following the influx of Ca+ ions and the subsequent fusion of synaptic vesicles with the plasma membrane.
E) When the K+ ion channels in the stereocilia close.
Explanation / Answer
A) When neurotransmitter is released into the synaptic cleft at its base and diffuses to the afferent neuron.
When neurotransmitter (glutamate) is released into the synaptic cleft at its base and diffuses to the afferent neuron, causing the hair cells in the cochlea of the inner ear to depolarize.
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