Renal conservation of water
…ncentrated urine (the concentration of which is determined by the degree of tonicity of the medulla). This is accomplished as follows: 1. Normally the glomerular filtrate has a similar osmolality to plasma (300 mOsmol/kg). In the descending limb of the loop of Henle, the NaCl cannot be absorbed, but water is passively resorbed (#1), creating a hypertonic urine (>1200 mOsmol/kg) as it enters the ascending limb. 2. When this NaCl-rich fluid enters…
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