Just out of curiosity, why does the Na curve dip down like in the figure below? I can't seem to find an explanation!

ion currents during action potentials

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    $\begingroup$ AP? Please do not use non-standard abbreviations in questions, especially in titles as they defy the indexing system this site relies on and confuse readers. $\endgroup$ – David Mar 7 at 21:58
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    $\begingroup$ Please edit your post to include the source of your figures — you should always include reference information for quotes and images. Also, are you asking about the left panel or the right panel ? ——— I made what I believe to be corrections to your title (nudge makes no sense in this context) — please check that the new wording is consistent with what you were trying to ask. $\endgroup$ – tyersome Mar 7 at 22:07

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