Osmolarity and Tonicity

Question 1

How much of body weight is water?

Answer 1

60%

Question 2

How much of the total body water is ECF?

Answer 2

1/3 (25 % plasma)

Question 3

How much of the total body water is ICF?

Answer 3

2/3

Question 4

What is the liquid between capillaries?

Answer 4

Interstitial fluid

Question 5

Osmolarity

Answer 5

(mol x dissociation factor / L = Molarity x dissociation factor)

Question 6

Dissociation factor for NaCl and glucose?

Answer 6

2 and 1

Question 7

What is the concentration of normal saline?

Answer 7

0.9% saline ( 9 g of NaCl in 1000 g water) 300 mOsM

Question 8

How cells behave based on concentration

Answer 8

Solution Cell behavior when placed in solution Description
A cell swells (hemolyse) solution is hypotonic
B no change isotonic
C cell shrinks (crenate) hypertonic

Question 9

Example of nonpenetrating particle

Answer 9

NaCl

Question 10

Example of penetrating particle

Answer 10

glucose, urea

Question 11

Does water volume change with non penetrating particles?

Answer 11

No, water doesnt care about penetrating particles because it doesnt need to move