Name the body fluid compartments, noting their locations and the approximate fluid volume in each.

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Identify the two main body fluid compartments: the intracellular fluid (ICF) and the extracellular fluid (ECF).

Understand that the intracellular fluid (ICF) is the fluid located inside the cells, making up about two-thirds of the total body water.

Recognize that the extracellular fluid (ECF) is the fluid outside the cells, which accounts for about one-third of the total body water.

Break down the extracellular fluid into its subcompartments: the interstitial fluid (fluid between cells) and the plasma (fluid component of blood).

Note the approximate volumes: intracellular fluid is about 25 liters, interstitial fluid about 12 liters, and plasma about 3 liters in an average adult human.

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Body Fluid Compartments

Body fluid compartments are distinct spaces within the body where fluids are distributed. The main compartments include the intracellular fluid (inside cells) and extracellular fluid (outside cells), which is further divided into interstitial fluid and plasma.

Intracellular and Extracellular Fluid Locations

Intracellular fluid is located within the cells and constitutes the majority of body water. Extracellular fluid surrounds the cells and includes interstitial fluid (between cells) and plasma (within blood vessels), each serving different physiological roles.

Approximate Fluid Volumes in Compartments

In an average adult, total body water is about 60% of body weight; roughly two-thirds is intracellular fluid (~25 liters), and one-third is extracellular fluid (~15 liters), with interstitial fluid around 12 liters and plasma about 3 liters.