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Unformatted text preview: which act as filters, excluding blood cells and proteins from entering the Proximal Tubule Proximal Tubule Active transport "OUT" of Na+. Na+ co-transport of glucose, amino acids, vitamins, etc. H 2 O out by osmosis (65% of entering). Toxin excretion. Loop of Henle Establishes Na+ concentration gradient which "extracts" H 2 O from urine (by osmosis) as it descends through this gradien collecting ducts. Distal Tubule Similar to Proximal Tubule. Hormonally regulated K+ secretion and H 2 O Collecting Duct "Descends" from cortex, through medulla, emptying into Renal Pelvis. "Descends" through increasing Na+ concentration H 2 O removed by Osmosis. Final urine is what drips out of collecting duct...
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