forces across membranes 3

Question 1

osmosis

Answer 1

the net movement of water from an area of high conc to an area of low conc. via aquaporins.

Question 2

what is osmosis determined by?

Answer 2

water has no barrier.
some solutes are selectively permeable across the membranes.
so water will move across barriers in order to ensure that the concentration of solute and water is the same on both sides of the particle. this implies that the compartment is expandable as the volume of water will change

Question 3

osmotic pressure

Answer 3

the pressure required to prevent water movement

Question 4

how is a mole measured. units

Answer 4

6.02x 10^23 molecules

Question 5

concentration- how is it measured

Answer 5

moles/litre

Question 6

why is concentration misleading in terms of osmosis?

Answer 6

one mole can dissociate into multiple particles.

Question 7

define osmolarity and tonicity

Answer 7

osmolarity; the number of particles in a solution. measured in osmoles or milliosmoles/litre
tonicity: the number of non-penetrating particles in a solution. more important as it determine cell volume.

Question 8

what is the osmolarity of plasma?

Answer 8

285 mosmol/litre

Question 9

iso
hypo
hyper

Answer 9

iso= SAME
hypo= FEWER
hyper=MORE