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Chapter 12 Transport Process (Diffusion, Osmosis and Active Transport (3…
Chapter 12 Transport Process
Diffusion, Osmosis and Active Transport
Diffusion
movement of particles from high -> low concetration
diffusion through membrane
Osmosis
3 types of Membranes
Completely Impermeable
Don't allow anything to pass
Selectively Permeable
Allows Certain substances to pass through
All lipid/protein membranes
Freely Permable
Allows all solutes to diffuse
Molecular Pumps
Active Transport
Use ATP to force molecules across membranes
Intracellular Transport
Vesicle migrate through cytoplasm ->
Vesicle attaches with another organelle
Water Potential
Cells and Water Movement
Water moves to place with the least potential
(moves to more negative)
Plant cells can never burst
if two cells have same potential
Equilibrium
Water potential in living cells
0.0 or negaitve
Short- Distance Intercellular Transport
Guard Cells
The opening and closing of Stomata
Motor Cells
"joint" cells that help some plants move to stimuli
Transfer Cells
molecular pumps
Long Distance Transport: Phloem
Movement: Pressure Flow Synthesis
Source
Active transport moves sucrose to STM
As Pressure builds, moves down STM
Ends at Sink
Sources
site were water and nutrients are transported
Long Distance Transport: Xylem
Properties of Water
Adhesive
Interaction with other substances
Cohesive
Interaction with itself
Water Transport through xylem
Cohesion-Tension Theory
Control of Water Transport by Guard Cells
Open Stomata
The trade-off of CO2 and water loss
