Renal sodium reabsorption
In renal physiology, renal sodium reabsorption refers to the process by which the kidneys, having filtered out waste products from the blood to be excreted as urine, re-absorb sodium ions (Na+) from the waste. It uses Na-H antiport, Na-glucose symport, sodium ion channels (minor).
Source: Wikipedia — Renal sodium reabsorption (CC BY-SA 4.0)