water movement across membranes Flashcards
1
Q
conc of Na+ in and out of cell
A
145mM OUT AND 12 mM in
2
Q
come of Cl- in and out of cell
A
123mM out and 4.2mM in
3
Q
conc of Ca2+ in and out of cell
A
1.5mM out and 10^-7 in
4
Q
conc of K+ in and out
A
140mM in and 4mM out
5
Q
define osmole
A
measure of solution’s ability to create osmotic pressure and thus affect the movement of water
6
Q
what will happen to the osmotic pressure of a swelling cell
A
increase
7
Q
what are water channels called and some features
A
aquaporin channels
integral membrane protein
tetrameric
permits rapid water diffusion above rate of passive diffusion through the lipid bilayer
hydrophilic pore
single file passage
positively charged residues in pore prevent the movement of charge ions
