What steps are involved in the net reabsorption of sodium ions from the tubular lumen back into the blood?

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What steps are involved in the net reabsorption of sodium ions from the tubular lumen back into the blood?



1. Sodium diffuses across the luminal membrane into the cell down an electrochemical gradient established by the sodium-potassium ATPase pump on the basolateral side of the membrane.

2. Sodium is transported across the basolateral membrane against an electrochemical gradient by the sodium-potassium ATPase pump.

3. Sodium, water, and other substances are reabsorbed from interstitial fluid into the peritubular capillaries by ultrafiltration.

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