Which of the following is true of an action potential?
a. an action potential requires 5 msec for completion
b. the potassium channels are opened at a lower voltage than are sodium channels (not this)
c. the sodium channels are opened at a lower voltage than are potassium channels
d. the overshoot is due to a prolonged change in sodium conductance
e. during an action potential, the interior becomes even more negative (not this)