Desert animals need to concentrate urine. what structural changes in the kidney would be associated with a kidney that is exceptionally good at concentrating urine? check all that would apply.

The correct answer for the question that is being presented above is this one: "C.)More juxtamedullary nephrons." 

Here are the following choices:

A.)Longer loop of Henle 
B.)Longer collecting duct 
C.)More juxtamedullary nephrons 
D.)Longer proximal and dist

Na+ loss through sweet plus the dilution has lowered na+ concentration outside of neurons, altering the na+ equilibrium potential. sodium exists more outside the cells than inside. when na+ is lost by sweat plus the dilution( because they drink a lot of water) changes the concentration outside the cell, forcing the water to enter the cell and attempt to balance the concentration inside/outside.the problem is that the abundance of water will cause the cells to swell. most cells can adapt, however, the brain cells can't that's why the runner has confusion and can't control the muscles.  if not treated and this occurs in less than 48 hours, it can be immediately fatal .

The answer is ldls; hdls