![]() ![]() This fluid is distributed between blood plasma, interstitial fluid, and intracellular fluid with the following proportions: Body Fluid Compartment: Proportion (%) of Total Body Water (TBW): Blood Plasma 6.6 Interstitial Fluid 33.0 Extracellular Fluid (ECF) 26.4 Intracellular Fluid 67.0 67. The volume and composition of body fluid compartments are strictly controlled. Learning Objectives Distinguish between intracellular and extracellular fluids Key Points The intracellular fluid of the cytosol or intracellular fluid (or cytoplasmic matrix) is the liquid found inside cells. For a typical 70 kg person, approximately 42 kg of this weight is water (which is equivalent to a volume of approximately 42 L of water). The major body-fluid compartments includ: intracellular fluid and extracellular fluid (plasma, interstitial fluid, and transcellular fluid). These ions are important for water transport throughout the body. It is important to understand how volume and osmolality of ECF and ICF in abnormal states changes. Body fluids can be discussed in terms of their specific fluid compartment, a location that is largely separate from another compartment by some form of a physical barrier. Anions include: chloride ( mEq/L) and hydrogen carbonate (HCO3- 22-26 mM). ![]() Background Information: Body Fluid Compartments The human body is made up of roughly 60% water with dissolved ions in various body fluid compartments. The extracellular fluid is mainly cations and anions. ![]()
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