| Term | Definition |
|
total body water |
60% of body weight (1 liter of water = 2.2 lb = 1 kg) |
|
intracellular fluid |
2/3 TBW or 40% of TBW; all the fluid within cells |
|
extracellular fluid |
1/3 TBW or 20% of TBW; interstitial fluid and intravscular |
|
capillary hydrostatic prssure |
outward movement of water from capillary to interstitial space |
|
capillary oncotic pressure |
attraction of water from interstitial to capillary |
|
interstitial hydrostatic pressure |
facilitation of inward movement of water from interstitial space to capillary |
|
interstitial oncotic pressure |
attracts water from capillary to interstitial space |
|
net filtration |
movement of fluid back and forth across the capillary wall |
|
forces favoring filtration |
capillary hydrostatic pressure and interstitial oncotic pressure (water is moving into interstitial space) |
|
forces opposing filtration |
capillary oncotic pressure and interstitial hydrostatic pressure (water is moving into capillary space) |
|
arterial end of capillary |
hydro > capillary oncotic pressure-fluid moves into interstitial space (filtration) |
|
venous end of capillary |
cop >hydro=fluid moves back into circulation (reabsorption) |