Urine Formation: Water Conservation/Collecting Duct Further Concentrates Urine
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12 Terms
What is a key function of the kidney in urine formation?
Eliminate metabolic wastes while preventing excessive water loss
How does the kidney return water to the tissue fluid and bloodstream?
by the Tubular secretion
What happens as the kidney returns water to the tissue fluid and bloodstream?
The remaining renal tubular fluid becomes more concentrated
As water is reabsorbed, what happens to the fluid remaining in the renal tubules?
It passes as urine and becomes more concentrated
What further the concentrates of urine?
Collecting Duct
Where does the collecting duct begin?
Cortex
The collecting duct receives tubular fluid from…
several nephrons
What happens as the collecting duct passes through the medulla?
Water continues to be reabsorbed, concentrating urine
The medullary portion of the collecting duct is more permeable to…
water than NaCl
Why does water leave the collecting duct in the medulla?
Osmosis due to the salty medulla
As water leaves, what happens to the urine?
It becomes more concentrated
What is the approximate maximum concentration of urine after passing through the collecting duct?
1200 mOsm/L