概論論/細胞内小器官/細胞膜/チャンネル（チャネル）/イオンの拡散/Na+チャンネル（チャネル）
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POINT!
| When the sodium (Na+) channel is open, sodium (Na+) diffuses from the outside to the inside of a cell. |
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As the concentration of sodium (Na+) is higher outside the cell, when the sodium channel opens, sodium ions diffuse from outside to inside of the cell.
Challenge Quiz
1.
When the sodium (Na+) channel is open, sodium (Na+) diffuses from the inside to the outside.from the outside to the inside of a cell.