Which ion channel is responsible for the rising phase of the action potential 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 Vm
Answer: 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
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