fluid compartments and composition

Question 1

Concentrations of ions in body fluids:

Extracellular / Intracellular Sodium

Answer 1

E=140 mM / I=15 mM

Question 2

Concentrations of ions in body fluids:

Extracellular / Intracellular potassium

Answer 2

E=4 mM / I=140 mM

Question 3

Concentrations of ions in body fluids:

Extracellular / Intracellular calcium

Answer 3

E= 2.4 mM / I=0.1 µM

Question 4

Concentrations of ions in body fluids:

Extracellular / Intracellular cloride

Answer 4

E= 110 mM / I=~10mM

less than extracellular, but widely ranging bicarbonate 25 mM typically 10-20 mM, depending on cell pH

Question 5

Volumes of body fluid compartments in a 70 kg person:

total body fluid volume

Answer 5

42 L (~60% of total body volume)

Question 6

Volumes of body fluid compartments in a 70 kg person:

intracellular fluid volume

Answer 6

28 L (~ 40% of total body volume)

Question 7

Volumes of body fluid compartments in a 70 kg person:

extracellular fluid volume

Answer 7

14 l (~20% of total body volume)

Question 8

extracellular fluid volume 14 l (~20% of total body volume) 
of which:
plasma
interstitial  
transcellular

Answer 8

plasma 3 L
interstitial 10 L
transcellular 1 L

Question 9

Osmotic potential of most fluid in body

Answer 9

Osmotic potential of most fluid in body 290 osmoles

Question 10

why must cellular Ca2+ level be kept low

Answer 10

Ca2+ must be kept low because otherwise it would precipitate with organic phosphates