Water reabsorption into the capillaries associated with a nephron is achieved principally by

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Water reabsorption from the nephron into the capillaries is achieved by active transport and osmosis. Active transport moves ions and other solutes out of the filtrate into the interstitial fluid, creating a concentration gradient that drives the osmosis of water out of the filtrate and into the capillaries. Bulk flow and countercurrent multiplication are involved in regulating the composition of the filtrate, but they are not the primary mechanisms for water reabsorption into the capillaries. Phagocytosis is not involved in water reabsorption.

Water Reabsorption into the Capillaries Associated with a Nephron Is