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Body Composition and Body Fluids: Distribution and Measurement

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Body Composition and Body Fluids: Distribution and Measurement

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Questions and Answers

What is the total body water (TBW) as a percentage of the total body weight?

60% (correct)

80%

20%

40%

Which substance is commonly used in the measurement of total body water?

Thiosulfate

Evans blue dye

Antipyrine

Tritium oxide (correct)

What is the percentage of water in the body composition of a 70kg adult male?

15%

60% (correct)

18%

What is the main cation found in the intracellular fluid (ICF)?

Potassium (K+) Signup and view all the answers

How does the percentage of total body water (TBW) vary with age?

It decreases with age Signup and view all the answers

How is the volume of distribution calculated in the indicator dilution method?

$amount\ injected-amount\ excreted\ or\ metabolized/concentration\ of\ substance\ in\ the\ sample$ Signup and view all the answers

Why is the percentage of total body water (TBW) lower in females than in males?

Females have a higher percentage of fat Signup and view all the answers

How can blood volume be calculated from plasma and packed cell volume (PCV)?

$Blood = Plasma \times 100/100-PCV$ Signup and view all the answers

What is the intracellular fluid (ICF)?

Fluid inside the cells Signup and view all the answers

In which group is the percentage of total body water (TBW) highest?

Thin-tall subjects Signup and view all the answers