? Part G - Conclusion/Synthesis: Resting Membrane Potential, Part II Cl? is a common, negatively charged extracellular ion. Predict the effect on the RMP if many Cl? gated channels are suddenly opened. ? View Available Hint(s) The RMP would become more positive. The membrane would become hypopolarized or have less charge separation across the membrane. There would be no change in the RMP. A more negative RMP would result.
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The cells from the same organism in the previous question are briefly exposed to a molecule that triggers the opening of ion channels that are selective for either chloride or potassium ions, but not both. The change in membrane potential in response to the molecule is shown below, where the gray bar indicates the duration of exposure. Based on this result, which statement is best supported? Note: A depolarization moves the membrane towards more positive or less negative values from its starting point; a hyperpolarization moves the membrane potential towards less positive or more negative values from its starting point. Add Molecule Membrane Potential (mV) -65 -75 -85 Time
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Imagine Ecl is -60 mV and the cell resting membrane potential is also at -60 mV. Now, if GABA is released onto the cell, you will see: A depolarization AND the cell will become more excitable A depolarization AND the cell will become less excitable A depolarization AND no change in excitability will occur A hyperpolarization AND the cell will become more excitable A hyperpolarization AND the cell will become less excitable A hyperpolarization AND no change in excitability will occur No change in resting membrane potential AND the cell will become more excitable No change in resting membrane potential AND the cell will become less excitable No change in resting membrane potential AND no change in excitability will occur
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