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Chapter 12 Transport Processes (Water Potential (Cells and Water Movement,…
Chapter 12 Transport Processes
Diffusion
Passive due to concentration gradients
Random Process
Incurs net movement at all times
Water Potential
Cells and Water Movement
Fluid Dynamics
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See thermo's notebook
Chemical Potential
The combining form of pi and sigma is pronounced "psi"
Osmotic Potential
Determined by solute concentration
Plasmolysis
Cell death from too much solute on the outside
Free energy does not exist
Matric Potential
Refers to capillary motion
Short Distance Intercellular Transport
Transport Cells
Motor Cells
Form joints between stem and midvein
Use potassium to control turgor pressure
#
Venus flytrap uses this to catch insects
Guard Cells
Hydraulic equilibrium closes them
Potassium controlled
Across short distances
Protoplasm cells are called Symplast
Wall and intercellular space are called the Apoplast
Osmosis
Through a membrane
Selectively
Impermeable
Freely
Active Transport
Molecular Pumps
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Aquaporins
Speed
Vacuole Transport
Vesicles made of cell membrane
LDT Xylem
Properties of Water
Adhesion
Stick to you
Cohesion
Stick to itself
Water Transport Though Xylem
cohesion-tension hypothesis
transcuticular transpiration
water loss directly from cuticle
transstomotal transpiration
water loss occurring in the apoplastic space
Poikilohydry
Water content change dependent on the environment
Water Control by Guard Cells
Can be used to mitigate low water environments to be survivable
To non-neighboring cells
LDT Phloem
STM/CC Complex
Transports Sugars
Sources
Fall/Winter
Roots
Spring/Summer
Leaves
Pressure Flow Hypothesis
Active Transport
Membrane-bound pumps control water
Sinks
Storage Organs
Damage can lead to bleeding
Controls Selected Molecules
Water Movement
Ion Concentration Driven
