Which ion mainly mediates the changes in postsynaptic membrane potential following activation of GABA-A receptors?  sodium   phosphate   chloride   calcium   potassium

A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple ChoiceThe high concentration of potassium ions in the cytoplasmPresence of receptor sites on the membraneAbsolute refractory periodHigh concentration of sodium ions in the extracellular fluid

Reestablishment of the resting membrane potential occurs throughMultiple ChoiceActive transport of sodium and potassium ionsDiffusion of sodium and potassium ionsActive transport of only sodium ionsActive transport of only potassium ions

The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsMembrane permeabilitySodium ionsLocal currents

Resting membrane potential:Results in high concentrations of Na+ on the outside of the cellIs maintained by the sodium/potassium ATPase pump continuously pumping Na+ into the cellResults in the outside of the cell having a -70mV polarity relative to the inside.Is the process by which cells communicate

An action potential arriving at the presynaptic terminal causesMultiple Choicevoltage-gated sodium ion channels to open, and sodium ions to diffuse out of the cell.voltage-gated calcium ion channels to open, and calcium ions to diffuse into the cell.voltage-gated sodium ion channels to open, and sodium ions to diffuse into the cell.ligand-gated sodium channels to open, and sodium ions to diffuse out of the cell.acetylcholine to diffuse into the cell.