You are coaching a little league team and are playing a double-header on a very hot day. One of your players, a very curious 13-year-old girl wonders why Gatorade advertises the presence of electrolytes in their beverages as beneficial to athletes. How would you explain to your player that electrolyte and water balance in the body are dependent upon each other? Be sure to let her know how we acquire water and electrolytes, their importance within the body, and how we regulate that balance in varying conditions.