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Loop of Henle
The loop of Henle is a U-shaped tube found in the nephron, the kidney’s functional unit. It is responsible for creating a concentration gradient in the medulla, enabling the production of concentrated urine.
Osmosis
Osmosis is the passive movement of water molecules across a semi-permeable membrane from a region of lower solute concentration (hypotonic) to a region of higher solute concentration (hypertonic).