After the rising phase, which ion channel is responsible for action potential returning to its
resting Vm and why?
A. Na+ channels, because positive Na* ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm
B. Na+ channels, because positive Na+ ions are at higher concentration inside the axon than outside, and so they leave the axon and raise Vm
C. K* channels, because positive K+ ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm
D. K channels, because positive K* ions are at higher concentration inside the axon than outside, and so they leave the axon and lower V m