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    • #17944
      autumnsphere
      Participant

      Hi huys, I have a problem with this statement: "Action potentials are formed when a stimulus causes the cell membrane to depolarize past the threshold of excitation, causing all sodium ion channels to open."

      Isn’t the cell membrane depolarized BECAUSE the ion channels open?

    • #115609
      GaryGaulin
      Participant

      I think you are correct (or more precisely when the Na+ channels open since the K+ open later). There is a threshold voltage that switches the state of what I found to be a flip-flop. The circuit is also called a "monostable multivibrator".

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