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transport process (water potential (cells and water movement (lysis (cells…
transport process
water potential
free energy of water
pressure potential
effect that pressure has on potential of water
megapascal
osmotic potential
effect that solutes have on water potential
number of paricles
cells and water movement
lysis
cells burst
not plant cells
incipient plasmolysis
protoplast lost enough water to pull slightly away from the wall
symplast
protoplasm one continuous mass
apoplast
molecules move through the wall and intracellular spaces
guard cells
motor cells
similar to guard cells
expel or accumulate potassium
adjust water potential
transfer cells
high volum transport
long distance transport: phloem
pressure flow hypothesis
sources
leaves are dominant
active transport
sugars
into sieve elements
polymer trap mechanism
phloem is loaded
STM/CC
used when conducting one or more companion cells
mass transfer
phloem per hour
specific mass transfer
divided cross sectional
sinks
receive transported phloem sap
p protein
goes into cell center
becomes tangled mass
too large to pass throuh
p protein plug
diffusion, osmosis, and active transport
diffusion
simple
high to low concentration
diffusion through a membrane
osmosis
membranes
freely permeable membranes
allow solutes to diffuse through them
little biological significance
completely impermeable
do not allow anything to pass through
isolation barrier
selectively permeable
only allow certain substances
lipid, protein
water passes through all
aquaporins
molecular pumps
atp
active transport
all membranes important in transport processes
intracellular transport
vesicles migrate through cytoplasm
long distance transport: xylem
properties of water
liquid water
cohesive
adhesive
interact
water transport through xylem
cohesion tension hypothesis
most accepted
transstomatal transpirtation
water loss
transtuticular transpiration
water lost directly through cuticle
control of water transport by guard cells
bulk water movement through xylem
influenced and powered by water loss
