Forces Acting Across Membranes

Question 1

What is osmolarity?

Answer 1

Total number of particles in solution

Question 2

What is tonicity?

Answer 2

Number of non-penetrating particles in solution

Question 3

What is the volume of water dependent on?

Answer 3

Non-penetrating particles
ECF - Na, Cl
ICF - K

Question 4

What is a hypo-osmotic solution?

Answer 4

Solution with less solute particles

Swell

Question 5

What is a hyper-osmotic solution?

Answer 5

Solution with more solute particles

Shrink

Question 6

What is a hypo-tonic solution?

Answer 6

Solution with less non-pen particles

Swell

Question 7

What is a hyper-tonic solution?

Answer 7

Solution with more non-pen particles

Shrink

Question 8

What is normal plasma osmolarity?

Answer 8

285 mosmol/L (rounded to 300)

Question 9

What happens when RBC is placed in water?

Answer 9

Swell and burst - lower water conc. inside cell due to non-pen ions in ICF

Question 10

What happens when RBC placed in hyperosmotic urea?

Answer 10

Swell and burst - urea is penetrating particle and diffuses in - haemolysis