Question

Why does the ammonium ion concentration differ in blood filtrate and urine?

Answer 1

Filtrate. The fluid filtered from blood, called filtrate, passes through the nephron, much of the filtrate and its contents are reabsorbed into the body. ... Reabsorbed fluids, ions, and molecules are returned to the bloodstream through the peri-tubular capillaries, and are not excreted asurine.


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Answer 2

However, they need a different concentration of various ions (Na, Ca, Cl, Mg ... In fish, most of the ammonia is released through the gills.