Question: Why cannot sodium ions pass through a potassium channel? A sodium ion is much bigger than a potassium ion. The potassium channel closes up whenever

Why cannot sodium ions pass through a potassium channel? A sodium ion is much bigger than a potassium ion. The potassium channel closes up whenever a sodium ion enters. The Na + ion cannot bind to the high-affinity K+-binding sites in the channel pore. It is highly energetically unfavorable for sodium ions to go through a potassium channel

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