An athlete sustains a severe blow to the lateral thigh. He has severe pain and muscle spasm, and is unwilling to move the extremity. You also note the limb appears shorten and laterally rotated. Which injury do you suspect

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 .

Answerreceives filtrate from blood instead of coelomic fluid;