Besides regulating salt and water balance and excreting nitrogenous wastes, the kidneys' other important role is

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The kidneys play an important role in regulating the pH of the blood by reabsorbing bicarbonate ions and excreting hydrogen ions or vice versa. This helps to maintain a stable pH balance in the body. While the kidneys do have some indirect effects on blood sugar and amino acid uptake through their role in regulating hormone levels, these functions are not their primary focus.

Besides Regulating Salt and Water Balance and Excreting Nitrogenous Wastes