Water and transportation
my
Diffusion is the passive movement of smaller faster
molecules with the concentration I temp P Kmt faster
A conc gradient faster
T pressure faster
Oasis water diffusion I diffusiondistance faster
iii
Passive high low
lighter faster
low solvent high solute
highsolvent low solute
constantly movingthroughchannel proteins
aqiporin until no net movement
tonicity
now the Ecf can change the volume of a cell by affecting osmosis
hypertonic ECF has Tsolutedsolvent waterleavescell
hypotonic ECF has d solute f solvent water into cell
Osmolarity low osmolarity Lsolute fsolvent
Y
solvent concentration in a solution high osmolarity I solutedsolvent
Osmoregulatory
regulates and able to control internal solute composition and maintain water
balance
Osmotic pressure
pressure that must be applied to a total Jsolute
solution to prevent osmosis
RT
Water potential is the combination of all three terms
howlikely water will move from outsideinside
water moves from PY odY
more negative Y the more likely water will diffuse intothat area
pure water O
addingsolute Y Yp Us
4 6.0bars
4 3.0 bars
solute 4 Y
alwaysnegative
i CRT c Ct 273K Yp 0 if open
conc of solute
e.g C 0.2M T 295K 1 1
Ys I CRT
i o any
0.08314bar Y Yp 4
my K 76295N 4 O 5
mm
ye
4.9 4bar Y 5
I