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In general, the extracellular water: total body water ratio (ECW/TBW) is higher in females. NOTES NOTES FLUIDS IN THE BODY BODY FLUID COMPARTMENTS /body-fluid-compartments GENERAL CHARACTERISTICS Fluid divisions in body Includes intracellular uid, extracellular uid 60-40-20 rule Total body water is 60 of body weight, of which two thirds is intracellular total intracellular uid is 40 of body. Approximately 25 YO of the extracellular component is in the vascular system (plasma) and 75 outside the blood vessels (interstitial fluid). Fluid can also move between compartments along an osmotic gradient. component of body water accounts for about 40 of body weight and the extracellular component for about 20 YO. Hydrostatic pressure is the force exerted by a fluid against a wall and causes movement of fluid between compartments. How do body fluids move between compartments? As a result, water will move into and out of cells and tissues, depending on the relative concentrations of the water and solutes found there. In the body, water moves through semi-permeable membranes of cells and from one compartment of the body to another by a process called osmosis. Simply so, how does Osmosis work in the 3 fluid compartments of the body? The remaining one-third of body water is outside cells, in the extracellular fluid compartment (ECF). The intracellular fluid is the fluid within the cells of the body. About two-thirds is in the intracellular fluid compartment (ICF). Subsequently, question is, what is the distribution of water in the major fluid compartments of the body? There are two main fluid compartments water occupies in the body. ADH is a hormone that helps the body to retain water by increasing water reabsorption by the kidneys. The kidneys can adjust the concentration of the urine to reflect the body's water needs, conserving water if the body is dehydrated or making urine more dilute to expel excess water when necessary. Fluid movement from the intravascular to interstitial and intracellular compartments occurs in the capillaries.Īlso, how does the body keep water balance? There are three major fluid compartments intravascular, interstitial, and intracellular. Body Fluid Compartments and Fluid Dynamics.