Podcast
Questions and Answers
What percentage of total body water (TBW) is typically found in a neonate?
What percentage of total body water (TBW) is typically found in a neonate?
- 40-45%
- 60-65%
- 50%
- 70-80% (correct)
What is the approximate ratio of extracellular fluid (ECF) to total body water (TBW)?
What is the approximate ratio of extracellular fluid (ECF) to total body water (TBW)?
- 1/2 TBW
- 3/4 TBW
- 2/3 TBW
- 1/3 TBW (correct)
Which of the following best describes the distribution of extracellular fluid (ECF) in the body?
Which of the following best describes the distribution of extracellular fluid (ECF) in the body?
- 1/4 intravascular, 3/4 interstitial (correct)
- 3/4 intravascular, 1/4 interstitial
- 1/2 intravascular, 1/2 interstitial
- 1/3 intravascular, 2/3 interstitial
What is the approximate blood volume percentage in a young adult?
What is the approximate blood volume percentage in a young adult?
In adults, what is the approximate total body water (TBW) percentage in females?
In adults, what is the approximate total body water (TBW) percentage in females?
What is the approximate intracellular concentration of Sodium (Na+)?
What is the approximate intracellular concentration of Sodium (Na+)?
What is the approximate intracellular concentration of Potassium (K+)?
What is the approximate intracellular concentration of Potassium (K+)?
Under normal conditions, which age group would you expect to have the lowest percentage of total body water (TBW)?
Under normal conditions, which age group would you expect to have the lowest percentage of total body water (TBW)?
Flashcards
Total Body Water (TBW)
Total Body Water (TBW)
The total amount of water in a person's body, expressed as a percentage of body weight.
ECF (Extracellular Fluid)
ECF (Extracellular Fluid)
Fluid outside of cells, making up about 1/3 of Total Body Water.
ICF (Intracellular Fluid)
ICF (Intracellular Fluid)
Fluid within cells, making up about 2/3 of Total Body Water.
Neonate TBW percentage
Neonate TBW percentage
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Elderly TBW percentage
Elderly TBW percentage
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Sodium in ECF vs ICF
Sodium in ECF vs ICF
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Potassium in ICF vs ECF
Potassium in ICF vs ECF
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Age-related TBW change
Age-related TBW change
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Study Notes
Total Body Water
- At birth, total body water accounts for 70-80% of body weight.
- At one year of age, it is about 70-75%
- In adults, males have 60% and females have 50-55% of their weight as total body water.
- In extreme old age, it is about 40-45%.
- Pregnancy increases blood and plasma volume by 45% and 50%, respectively.
Body Fluid Compartments
- Total body water is divided into extracellular fluid and intracellular fluid.
- Extracellular fluid (ECF) is one-third of total body water (TBW).
- ECF is further divided into interstitial fluid (comprising 3/4 of ECF) and intravascular fluid (comprising 1/4 of ECF).
- Intracellular fluid is the remaining two-thirds of TBW.
- These proportions are different at various ages
Composition of Fluid Compartments
- The table lists the composition of different fluid compartments (intracellular, interstitial, intravascular)
- It shows the concentration of various electrolytes (e.g., sodium, potassium, calcium, chloride, bicarbonate, phosphorus) in milliequivalents per liter (mEq/L) and protein in grams per deciliter (g/dL)
- Values are accurate for children 6 months of age and older
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