1.06 - Fluid Compartments

Question 1

What are the three major fluid compartments in the body?

Answer 1

Total Body Water (TBW)
Intracelular Fluid (ICF)
Extracellular Fluid (ECF)

Question 2

What is the approximate size of the ICF?

Answer 2

27L –> ~60% of TBW

Question 3

What is the ionic composition of the ICF?

Answer 3

High: K+, Mg2+
Low: Na+, Cl-, Ca2+

Question 4

What is the approximate size of the ECF?

Answer 4

18L –> 40% of TBW

Question 5

What is the ionic composition of the ECF?

Answer 5

High: Na+, Cl-, Ca2+
Low: K+, Mg2+

Question 6

What are the sub compartments of the ECF?

Answer 6

Plasma
Interstitial Fluid
Transcellular Fluid

Question 7

How are fluid compartments volumes measured?

Answer 7

Put a known volume of indicator in
Extract a sample of compartment fluid to measure how it is diluted
Calculate the volume based on dilution