What limits the diffusion of sodium ions?

 

What limits the diffusion of sodium ions?

Limiting Factor: Concentration of sodium ions outside cell. Evidence: As concentration increases, so too does the rate of diffusion. The effect of the concentration of sodium ions in the surrounding solution on their rate of diffusion across the membrane was investigated.

How do sodium ions move in and out of cells?

Sodium ions pass through specific channels in the hydrophobic barrier formed by membrane proteins. This means of crossing the membrane is called facilitated diffusion, because the diffusion across the membrane is facilitated by the channel. In this case, sodium must move, or be pumped, against a concentration gradient.

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