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Title: Water Reabsorption
Description: The steps- supplemented with a diagram great to understand the complex process with ease!
Description: The steps- supplemented with a diagram great to understand the complex process with ease!
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NadiaA
Water Reabsorption
Stages
Image source http://www
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org/posts/archives/2006-11/1164813835
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r
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Ascending Limb- The ascending limb is impermeable to water
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Higher up in
the tubule, sodium and chloride ions are actively pumped out into the medulla, making it
salty
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NadiaA
2
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As ions pumped out by the
ascending limb made the medulla salty, the medulla now has low water potential- it is
hypertonic- and the descending limb has a high water potential thus, water will diffuse via
osmosis from the descending limb to the tissue, now leaving the ascending limb with a low
water potential
...
Some sodium and chloride ions also diffuse into the descending limb
...
More water reabsorption occurs at the distal convoluted tubule; salts are pumped into the
tissue, creating negative water potential thus water diffuses by osmosis into the tissue then
eventually into the capillaries
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Note: In an exam question talking about the ionic movements, you need to talk about the ascending
limb first, then the descending limb; so the actions in the ascending limb first then what it causes in
the descending limb
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More water moves in via osmosis
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(PCT, DCT and Collecting Duct)
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Cortex
Medulla
Image source https://answersingenesis
Title: Water Reabsorption
Description: The steps- supplemented with a diagram great to understand the complex process with ease!
Description: The steps- supplemented with a diagram great to understand the complex process with ease!