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33 Cards in this Set

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The sum of fluids within all body compartments constitutes the ___________.
Total Body Water (TBW)
What is the normal percentage of body weight made up by water for a normal adult male?
60%
How much does one liter of water weigh?
Pounds
Kilograms
2.2 lbs
1 kg
One milliliter of water equals ______ of a liter.
1/1000
Name the three compartments that water is distributed among in the body.
1. Intracellular Fluid
2. Extracellular Fluid
3. ?
How much of the TBW is in the intracellular fluid compartment?
2/3
How much of the TBW is in the extracellular fluid compartment?
1/3
What are the two main ECF compartments?
1. Interstitial Fluid
2. Intravasucular fluid
What is interstitial fluid?
The space between the cells and the outside of the blood vessels.
What is intravascular fluid?
Blood Plasma
How much of Extracellular Fluid does interstitial fluid contain?
3/4 of fluid is between the cells
How much of the ECF does the intravascular fluid contain?
1/4 of fluid is in the vessels
The percentage of TBW varies with the amount of _________ and ________.
The % of total body water varies with the amount of FAT and AGE.
Why is very little water contained in adipose (fat) cells?
Because fat is water repelling (hydrophobic).
Individuals with more body fat have proportionately less TBW and tend to be more susceptible to______________.
Dehydration
The primary sources where our bodies obtain water from are___1___,___2___, and ___3____.
1. Drinking
2. Ingestion of water in food
3. Water derived from oxidative metabolism
The largest amounts of water are lost through _______.
Renal Excretion (Urine)
Sensible Fluid Loss
What is it?
What are examples of it?
Fluid loss that we can see
1. Urine
2. Stool
3. Wounds
4. Sweat
Where does most sensible fluid loss come from?
Renal Excretion (Urine)
What is the normal daily input and output of water in milliliters through urine?
1400-1800 ml
Including all 3 of the primary ways in which our bodies obtain water how much is the normal daily water gain and loss in milliliters?
2400-3200 ml
At birth TBW represents ___% of body weight.
75%-80%
Why are infants more susceptibel to significant changes in TBW?
They have a highter metabolic rate and a greater body surface area.
Why does TBW in the elderly decline?
1. Increase in fat and decrease in muscle.
2. Reduced ability to regulate Sodium and water balance.
3. Kidneys are less efficient in making concentrated urine.
Water moves between the ICF and the ECF compartments primarily as a function of ______________.
Osmotic Forces
What is responsible for the ECF osmotic balance?
Sodium
What is responsible for the ICF osmotic balance?
Potassium
The movement of fluid back and forth across the capillary wall is called___________.
Net Filtration
What is Starling's Hypothesis?
Net Flitration=Force Favoring Filtration-Forces Opposing Filtration
___________ is the movement of water out of the capillary and into the interstitial space.
Filtration
Forces favoring filtration include___1___ and___2___.
1. capillary hydrostatic pressure
2. interstitial oncotic pressure
Forces opposing filtration are___1___and ___2___.
1. plasma oncotic pressure
2. interstitial hydrostatic pressure
The accumulation of fluid within the interstitial spaces is called ________.
Edema