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Guyton 25 Body Fluid Compartments: ECF and ICF Final Exam Study Test. CA$20.28   Add to cart
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Guyton 25 Body Fluid Compartments: ECF and ICF Final Exam Study Test.
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Guyton 25 Body Fluid Compartments: ECF and ICF Final Exam Study Test. How do the kidneys help maintain homeostasis? - CORRECT ANSWER Maintain relatively constant volume and stable composition of body fluids: 1. regulate body fluid volume (via output/ retention) 2. regulate constituents of EC f...

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  • November 6, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • guyton 25 body fluid compartments ecf and icf fin

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Guyton 25 Body Fluid Compartments:
ECF and ICF Final Exam Study Test.
How do the kidneys help maintain homeostasis? - CORRECT ANSWER Maintain relatively constant
volume and stable composition of body fluids:

1. regulate body fluid volume (via output/ retention)

2. regulate constituents of EC fluid (via output/ retention)

3. acid-base balance



Composition of fluid in the body - CORRECT ANSWER Total body water: 60% BW

ICF (2/3 TBW): 40% BW

ECF (1/3 TBW): 20% BW



Interstitial fluid: 15% BW

Plasma: 5%



Other constituents: transcellular (<1%): synovial, peritoneal, pericardial, intraocular, cerebrospinal



Which types of fluid are more readily exchanged constituents? - CORRECT ANSWER Plasma and
interstitial fluid



Passing across from ECF to ICF requires pumps, and channels



What drives water movement? - CORRECT ANSWER Starling forces (hydrostatic)

Osmotic forces



What percent of body weight is blood? - CORRECT ANSWER 7% bodyweight

, What differences in composition are there between plasma and interstitial fluid? - CORRECT ANSWER
Protein concentration only



Capillary membranes are highly permeable to water and ions, and less permeable to proteins

Donnan Effect: negatively charged plasma particles repelled.



How permeable is the intra- and extra-cellular space? - CORRECT ANSWER Highly permeable to water,
not permeable to most other electrolytes in the body



How is fluid volume measured/ estimated - CORRECT ANSWER Indicator/ dilution principal

- place indicator substance in compartment, allw to disperse evenly, and analyze the substance dilution.



c1v1=c2v2

v2 = c1v1/c2



How are specific compartments determined? - CORRECT ANSWER Total body water: 3-H2O, 2-H2O



ECF - 22-Na, 124-L-iothalamate, inulin -- substances that disperse inp lasma and interstitial fluid but do
not penetrate cell membrane -- aka Sodium space, inulin space



Plasma volume- 125-albumin, Evans blue dye -- not readily passed through capillarymembranes; remains
in vascular system



What compartment cannot be measured directly? - CORRECT ANSWER Intracellular fluid -- must be
calculated from Total H2O - ECF



How do you calculate blood volume? - CORRECT ANSWER Blood volume = (plasma volume)÷ (1-
hematocrit)



How do you calculate interstitial volume? - CORRECT ANSWER Interstitial volume = ECF-plasma volume

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