Observe the action potential and state the correct events that occur in Phase I and Phase II .

Options

A. Phase I : Sodium channels open causing movement of sodium ions from the extracellular fluid to the axoplasm . Phase II : Potassium channels open causing movement of potassium ions from the extracellular fluid to the axoplasm.
B. Phase I : Sodium channels open causing movement of sodium ions from the extracellular fluid to the axoplasm . Phase II : Potassium channels open causing movement of potassium ions from the axoplasm to the extracellular fluid.
C. Phase I : Sodium channels open causing movement of sodium ions from the axoplasm to the extracellular fluid . Phase II : Potassium channels open causing movement of potassium ions from the extracellular fluid to the axoplasm.
D. Phase I : Sodium channels open causing movement of sodium ions from the axoplasm to the extracellular fluid . Phase II : Potassium channels open causing movement of potassium ions from the axoplasm to the extracellular fluid.

Answer

B