Fluid

• Water in the Human Body:

• Most abundant constituent (50-60% of body weight)

  • Women: ~50%
  • Men: ~60%

• Total Body Water Compartments:

• Intracellular Fluid (ICF): 55-75% of total body water
• Extracellular Fluid (ECF): 25-45% of total body water
  • ECF subdivisions:
  • Intravascular (plasma water)
  • Extravascular (interstitial)
  • Ratio (intravascular : extravascular) = 1:3