If you experimentally reduce the concentration of K+ in the extracellular fluid surrounding hair cells in the inner ear, the result would be like which of the following?

Question

Quizplus · Accepted Answer

K+ ions play a crucial role in the depolarization and subsequent release of neurotransmitters by hair cells. These hair cells depolarize in response to sound waves, which causes the opening of voltage-gated calcium channels allowing for an influx of Ca2+ ions. These Ca2+ ions trigger the release of neurotransmitters from the hair cells.
If the extracellular concentration of K+ ions surrounding the hair cells is decreased, it would limit the magnitude of depolarization (reducing the positive current needed to open voltage-gated Ca2+ channels), leading to a decrease in the release of neurotransmitter by hair cells. Therefore, Option A is the best choice.

If You Experimentally Reduce the Concentration of K+ in the Extracellular