<prompt> Which of the following is the approximate extracellular fluid volume of a normal individual?5 of body mass10 of body mass20 of body mass40 of body mass  <response>: Sixty percent of the body mass is water. Of this water, one-third 20 of body mass is extracellular and two-thirds 40 of body mass is intracellular.The extracellular water is fuher divided into interstitial water 80 of the extracellular fluid, or 15 of body mass and plasma water 20 of the extracellular fluid, or 5 of body mass.The percentage of water in the body is a function of body fat. The greater the percentage of body fat, the lower the percentage of body water. 