Increasing permeability of the membrane to potassium (opening K+ channels) will have what effect on the membrane potential? The membrane potential will become more negative. The membrane potential will become more positive.The membrane potential will drift toward zero and remain there. The membrane potential will not change.

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08-12-2022
Biology

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Increasing permeability of the membrane to potassium (opening K+ channels) will have what effect on the membrane potential? The membrane potential will become more negative. The membrane potential will become more positive.The membrane potential will drift toward zero and remain there. The membrane potential will not change.

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e18554534 e18554534 · Answer 1 · 2022-12-14T23:46:00+01:00

Increasing potassium permeability across the membrane makes the membrane more negative.

Since the intracellular environment has a net negative charge and potassium is a positively charged ion, increasing the permeability of the membrane makes it more negative.

The high potassium permeability of the apical membrane promotes potassium secretion and has a repolarizing effect on the apical membrane potential, thereby sustaining ENaC-mediated sodium transport.

A series of voltage-gated potassium channels open and potassium flows out of the cell along an electrochemical gradient. These events rapidly lower the membrane potential and return it to its normal resting state.

Since resting neuronal membranes are highly permeable to K+, the membrane potential is sensitive to changes in extracellular potassium concentration. An increase in extracellular potassium concentration depolarizes neurons.

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