Describe the importance of the renal medulla as it pertains to reabsorption. Support your description by...

Describe the importance of the renal medulla as it pertains to reabsorption. Support your description by detailing at least three examples/processes/mechanisms of reabsorption

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Expert Solution

Kidney is responsible for excretion , 180 L of blood is filtered by the glomerulus per day but only 1.5 litres of urine is passed per day by a normal human . 99 percent is reabsorbed by the tubules in the kidney . Kidney is divided into an outer cortex and inner medulla . Medulla is the region involved in concentration of urine . It has renal pyramids between 2 renal pyramid os renal column .

The nephrons in renal pyramid is called juxtamedullary nephron and has long loop of henle and has vasa recta in it . Which is responsible for concentration of urine . Since loop of henle and vasa recta function as countercurrent mechanism.

3 process of reabsorption in renal tubules :

Active transport , it requires atp as energy , movement of solutes is against concentration gradient. Example glucose and aminoacids
67% of water will be reabsorbed by pct through osmosis along with the solutes . In the descending limb 15 % will be reabsorbed. This is an example for passive transport .
Another transport that is cotransport like symports and antiports exists which helps in glucose and sodium ions transport .

Sydney Mullin answered 10 months ago

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