Depolarization = ion channel opening?

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autumnsphere
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Depolarization = ion channel opening?

Post by autumnsphere » Wed Oct 29, 2014 2:18 pm

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?

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GaryGaulin
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Re: Depolarization = ion channel opening?

Post by GaryGaulin » Thu Jan 08, 2015 6:01 am

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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