What effect did increasing the extracellular potassium have on the resting membrane potential?The resting membrane potential became more negative.The resting membrane potential disappeared.The resting membrane potential did not change.The resting membrane potential became less negative.

What effect did decreasing the extracellular sodium have on the resting membrane potential?Only a small change occurred, because the resting neuron is not very permeable to sodium.Only a small change occurred, because the sodium channels were mostly open.The resting membrane potential disappeared.The resting membrane potential became less negative.

Which of the following changes would hyperpolarize a cell, that is, make the resting membrane potential more negative?  none of the choices are correct   decrease the temperature   increase extracellular levels of potassium   decrease the permeability of cells to potassium Correct Answer  decrease extracellular levels of potassium

The maintenance of a resting membrane potential is due to three factors:(1) The concentration of K+ the membrane is than that the membrane.(2) The concentration of Na+ the membrane is than that the membrane.(3) The membrane is permeable to K+ than Na+.

Finally, Rebecca conducted an experiment in which she added a small amount of concentrated KCl solution to the extracellular medium, doubling the value of [K+]out. She investigated how this affected the electrophysiological properties of the neurone. Before increasing extracellular K+ concentration the neurone was silent, ie. did not fire action potentials. After increasing [K+]out by adding KCl to the extracellular medium she observed

Based on Donnan equilibrium, what is the contribution to the resting membrane potential of the concentration imbalance of Potassium ions?[the typical internal Potassium concentration is about 150 mM, the external one about 5 mM; the prefactor for monovalent ions is about 61.5 mV]