The Intracellular Fluid is composed of at least 10 14 separate tiny cellular packages. Typical values for the size of the fluid compartments are Liters) based on which side of the cell membrane the fluid lies. The major division is into Intracellular Fluid (ICF: about 23 liters) and Extracellular Fluid (ECF: about 19 These collections are referred toĪs "compartments"". Together into larger collections which can be discussed in a physiologically meaningful way. The water in the body is contained within the numerous organs and tissues of the body. Differences in percent body water between males and females are primarily due to differences in amounts of adipose tissue.įor any particular tissue of the body the variation is very much less but any variation that occurs is still mostly due to differences in amount of fat content. Obese adults have a lower ratio because of the greater amount of adipose tissue. Differences (between individuals) in the amount of bone and plasma are much smaller. The variation between individuals in the ratio of TBW to total body weight is quite large but the majority of the variation is due to different amounts of adipose tissue as adipose has a low water content.
At birth, the amount of interstitial fluid is proportionally three times larger than in an adult. Neonates contain more water then adults: 75-80% water with proportionately more extracellular fluid (ECF) then adults. 2.1.1 Variations in Water Content Variation due to Age These figures are standard values which are quoted frequently and are average values. The hypothetical adult female contains 55% of her body weight as water: this lower percent being due to a higher fat content. The 70 kg 'standard male' contains 42 liters of water - 60% of his body weight.
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