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→Ion channels
===Ion channels===
===Ion channels===
{{Main|Ion channel|Passive transport}}
{{Main|Ion channel|Passive transport}}
[[File:Action potential ion sizes.svg|thumb|Despite the small differences in their radii,<ref>''CRC Handbook of Chemistry and Physics'', 83rd edition, {{ISBN|0-8493-0483-0}}, pp. 12–14 to 12–16.</ref> ions rarely go through the "wrong" channel. For example, sodium or calcium ions rarely pass through a potassium channel.|链接=Special:FilePath/Action_potential_ion_sizes.svg]]
[[File:Action potential ion sizes.svg.png|thumb|Despite the small differences in their radii,<ref>''CRC Handbook of Chemistry and Physics'', 83rd edition, {{ISBN|0-8493-0483-0}}, pp. 12–14 to 12–16.</ref> ions rarely go through the "wrong" channel. For example, sodium or calcium ions rarely pass through a potassium channel.|链接=Special:FilePath/Action_potential_ion_sizes.svg.png]]