Of the following events, which one should happen last during a normal action potential in a neuron? Group of answer choices Opening of voltage-gated sodium channels Facilitated diffusion of sodium Application of a stimulus that opens sodium leak channels Potassium moving through rectifying channels to create the charge differential of the relative membrane potential
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Drag and drop the following events of an action potential into its correct order: Voltage-gated Na+ channels open and Na+ floods into the neuron. Na+ channels inactivate and voltage-gated K+ channels open. Ligand-gated Na+ channels open. Voltage-gated K+ channels close and membrane potential approaches the resting membrane potential.
Adi S.
For each numbered area (1-4) in the top figure, find the corresponding part of the action potential trace in the bottom figure (time in msec) and describe amount and direction of Na+ flow. Why do the Na+ ions entering in region B cause opening of Na+ channels in region C but not in region A? Which of the following is/are TRUE? (Select ALL that are TRUE.) The flow of potassium ions in the leak current that sets the resting potential of the plasma membrane occurs because potassium ions are small enough to pass directly through the phospholipid bilayer. The potassium leak current involves net movement of potassium ions out of the cell, down their concentration gradient. At resting potential, the inside of the plasma membrane has a net negative charge. Depolarization of the plasma membrane occurs through opening of voltage-gated potassium channels. Repolarization of the plasma membrane after the firing of an action potential requires inactivation of the voltage-gated sodium channels.
Sri K.
In neurons, which of the following actions would create a graded potential that was hyperpolarizing? gated Ca+ channels open and calcium diffuses in gated K+ channels open and potassium diffuses out gated Na+ channels open and sodium diffuses in and gated Ca+ channels open and calcium diffuses out gated Na+ channels open and sodium diffuses in
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