7.3.2 - Urine Concentration and Dilution
Describe how the Kidney concentrates and dilutes the urine.
Draw your own diagram of this process (or add to your concept
map/Prezi) and teach what you have learned to a friend.
Explain the process of how the kidney adjust how much water is
excreted or reabsorbed depending on hydration status.
Using osmosis. When dehydrated, pulls water from tubule back into the
blood (concentrated urine) and when overhydrated, lets water stay in
the tubule (diluted urine).
What parts of the kidney reabsorb water?
About 15% reabsorbed
in the descending limb of loop of Henle
What parts of the kidney are impermeable to water?
limb of loop of Henle
Explain the purpose and function of the counter-current multiplier
system in the kidney.
How is the Loop of Henle a counter-current multiplier?
Since the two limbs are next two each other, one side moves ions and
the other side allows water to follow the ion gradient generated.
How is the Vasa Recta a counter-current multiplier?
It flows in a counter current to the filtrate and removes water from the
interstitial space of the medulla to maintain the needed concentration
gradient for the loop of Henle
Countercurrent Multiplication in the Loop of Henle:
Kidney and the Counter Current Multiplier by Aston University:
Water wants to _________________