Many ions and channels in heart are activated on depolarized state (activated state) . But only this Na+ Channel current also called “funny current” gets activated on hyperpolarized state (inanctivated state). Its effect has just opposite to other current in heart, thats why its called a funny current !
Was waiting for someone to ask on why its called funny current but you did thanks a lot professor !
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Thanks a lot for this answer. So the reason is really the fact that this current has a "funny" behaviour relative to the other currents. Cool to know! :)