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Assume that Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across that membrane.

Answers:
1) a gradient of less than 5% difference between sides for the Na+ and Na+ diffusing toward K+
2) a gradient of less than 5% difference between sides for the Na+ and Na+ diffusing toward Cl−
3)a gradient of more than 50% difference between sides for the Na+ and Na+ diffusing toward Cl−
4) a gradient of more than 50% difference between sides for the Na+ and Na+ diffusing toward K+

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