Body Fluid Compartment

Question 1

How much of the body is comprised of water? (On average)

Answer 1

60%

Question 2

Hematocrit definition

Answer 2

Fraction of the blood that is cells

Question 3

Plasma volume calculation

Answer 3

PV= Blood volume x (1-Hct)

Question 4

Blood volume calculation

Answer 4

BV= PV/ (1-Hct)

Question 5

What do membrane pumps keep from entering the cell?

Answer 5

Na+

Question 6

Substances for measuring Total Body Water

Answer 6

Deuterated water
Tritiated water
Antipyrine

Question 7

Substances for measuring ECFV

Answer 7

Labeled inulin
Sucrose
Mannitol
Sulfate

Question 8

Substances to measure Plasma volume

Answer 8

Radiolabeled albumin

Evans blue dye

Question 9

Compartments with no compartment specific substance

Answer 9

ICFV

ISFV

Question 10

What balancing force acts across the capillary membrane?

Answer 10

Starling forces

Question 11

ECF osmolarity rough estimation

Answer 11

2[Na+]

Question 12

Official calculation of Posm

Answer 12

2•([Na+]+[K+])+(glucose/18)+(BUN/2.8)

Question 13

Osmolarity gap

Answer 13

Measured-calculated.

Could be a foreign substance in the blood

Question 14

Possible foreign substances suggested bby the osmolar gap

Answer 14

Methanol
Uric Acid
Lactate
Ethylene glycol
Paraldehyde
Aspirin
Ketones
(MULEPAK)

Question 15

Urea’s effect on water movement?

Answer 15

None

Question 16

Plasma Expander Use

Answer 16

Solutions are confined to vascular compartment and preferentially expand portion of ECF