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Chapter 12 Transport Processes (short distance intercellular transport…
Chapter 12 Transport Processes
Diffusion, Osmosis, Active Transport
diffusion
parcels move from
high to low concentration
osmosis
diffusion through membrane
3 types of membranes
completely impermeable
nothing passes through
selectively permeable
certain substances diffuse
freely permeable
all solutes diffuse
molecular pump
uses ATP
active transport
water potential
free energy of water
potential is measured in:
megapascal
the water available in water
eutrophication
alge dies
eaten by bacteria
uses oxygen
can suffocate fish
seawater
not all plants can use
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short distance intercellular transport
symplast
all protoplasm of plant
apoplast
wall and intercellular spaces
motor cells
accumulate or expel potassium
adjust water potential, turgidity
transfer cells
labyrinthine walls
transfers material
the water available in air
incipient plasmolysis
protoplast lost water
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pulls away from wall
if pulls completely away from wall
cell becomes plasmolyzed
long distance transport: phloem
sources
water /nutrients
sinks
transported phloem sap
P-protein plug
callose
P-protein
long distance transport: xylem
properties of water
cohesive
any force acting upon
acts on neighboring molecules
adhesive
water molecules interact
with other substances
water transport through xylem
cohesion tension hypothesis
wind and current affect a waters potential
salt draws out water
only fresh water most plants can't use salt water
