Water Conservation

Water Conservation - Water Conservation The last step of...

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Water Conservation The last step of urine formation is the conservation of water from the collecting duct. This is accomplished by the regulating the permeability of the CD to water (by the presence or absence of ADH) and the reabsorption of water as the CD descends through the renal medulla. Recall that the nephron loop increases the salinity gradient of the renal medulla. The deep medulla has a much higher solute concentration than the outer medulla . As the CD descends through the increasingly high solute concentration of the renal medulla, water will be reabsorbed by osmosis. In other words, the very high osmolarity of deep medulla draws water out of the CD. The greater the gradient the more water will be removed from the urine. Countercurrent Multiplier The countercurrent multiplier generates the salinity gradient (high osmolarity ) of the renal medulla by recapturing NaCl and returning it to the renal medulla. When filtrate enters the descending limb of the nephron loop water is reabsorbed from the tubule but not salt (the
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Water Conservation - Water Conservation The last step of...

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