2. At rest, if we opened a Y3 channel, in what direction would the ion move? Res

Question

2. At rest, if we opened a Y3 channel, in what direction would the ion move? Resting membrane potential +78.4 mV. However, the equilibrium potential of Y'3 is -26.0 mV. If you open Y'3 channels, Y'3 will EXIT the cell down its concentration gradient since there is a greater concentration of Y'J inside the cell than outside. Since you are LOSING positive charge from the inside of the cell, the inside of the cell HYPERPOLARIZES· Y's will continue to leave until the inside of the cell reaches exactly -26.0 mV.

Explanation / Answer

There is high concentration of the ion Y3+ inside the cell when compared to the extracellular side. This is evident from the resting membrane potential of the cell which is positive (+78 mV) and equilibrium potential of the ion which is negative (-26 mV). So, when ion channel is opened, the Y3+ ion moves from an area of higher concentration to the area of lower concentration (from inside of the cell to outside) till the concentration becomes equal on either side.

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