All organisms require nitrogen to make amino acids, which in turn are used to build what?

Amino acids are used in the production of proteins!

importance of amino acids :
1 amino acids are used for the production of protein as they are building blocks of proteins ..
2 these proteins make hairs ,nails muscles tissues ..
3 it has important role in a balance diet ..
4 these are the second largest component that are present in human body
5 these are involve in the formation of hormones and enzymes ..

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 .