Question

17. What is true of Action Potentials (APs):
(A) The stronger the AP initiating stimulus, the higher the voltage will be generated by the AP during the depolarization phase (increasing voltage to +30mV, +40mV, +50mV, etc.).
(B) Always involve sequences of membrane voltage changes: resting state (maintaining at -70mV), threshold (-55mV), depolarization (increasing to +30mV), repolarization (decreasing to -70mV), and hyperpolarization (decreasing below -70mV).
(C) After AP initiation, the relative refractory period is the time when the cell cannot respond to another stimulus, no matter how strong.
(D) APs are triggered by some change in the cell’s membrane permeability that always causes current flows that decease in magnitude with distance traveled along the cell’s membrane (membrane potential decay).

Answer 1

B) Always involve sequences of membrane voltage changes: resting state (maintaining at -70mV), threshold (-55mV), depolarization (increasing to +30mV), repolarization (decreasing to -70mV), and hyperpolarization (decreasing below -70mV).