The kidneys operate in a two-stage process. In the first step, water and most of the small and water-soluble molecules are filtered out. Second, most of the water is reabsorbed, along with some of the dissolved chemicals.

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The kidneys filter blood in a two-step process: first, they filter out waste and water, and then they reabsorb water and necessary chemicals back into the body.

The Kidneys Operate in a Two-Stage Process