What is produced when depolarization of a cell membrane reaches threshold?Multiple ChoiceA new action potential is produced.An existing action potential is stopped.Voltage-gated ion channels close.The absolute refractory period ends.

Depolarization of the cell membrane occurs when there is a rapid influx (inflow) ofMultiple Choicecalcium ions.amino acids.sodium ions.potassium ions.chloride ions.

Depolarization of a cell membrane occurs because

Which event occurs during neuronal depolarization? a. membrane potential returns to normal b. cations leave the cytosol c. membrane potential remains stable d. membrane potential decreases e. plasma membrane becomes less permeable

Depolarization of a cell membrane occurs becauseMultiple ChoiceSodium ions are blocked from entering the cellMore sodium ions diffuse into the cell than potassium ions diffuse out of itThe concentration of sodium and potassium ions in the extracellular fluid is at equilibriumThe concentration of sodium and potassium ions in the cell is at equilibrium

Graded membrane potentials:Help determine whether a neuron will reach thresholdRely heavily on voltage gated ion channelsAre excitatory when they make membrane potential more negativeAre excitatory when they hyperpolarise the cell