In the descending limb of the loop of Henle,as the filtrate passes downward,it:

The glomerular filtrate in the loop of Henle gets concentrated in the descending and then gets diluted in the ascending limbs. Explain.

Salmon have gills that are more permeable to water than to salts. Salmon hatch in fresh water streams and then migrate to the ocean. Once they reach the ocean,you would expect the rate of uptake of water into their body through the gills to:

The concentration of urine depends upon which part of the nephron?

Why is a small amount of urea retained in the kidney matrix?

What does the following figure represent?