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Transport Processes (Chapter 12), Osmosis is diffusion through a membrane,…
Transport Processes (Chapter 12)
Active Transport-
use ATP energy to force molecules across the membrane
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Diffusion-
random movement of particles from areas of high concentration to areas of low concentration
Osmosis
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Water Potential-
chemical potential
Cells and Water Movement
Pressure, Matric, and Osmotic Potential; all part of water potential
Short Distance Intercellular Transport
Symplast- all the protoplasm of a plant
Apoplast- intercellular spaces and cell wall
Motor Cells
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Guard Cells
Transfer Cells- cells involved in rapid, short-distance, trandfer
Long-Distance Transfer: Phloem
not known; most evidence supports the pressure flow hypothesis
Pressure Flow Hypothesis-
flow in the phloem is due to active loading in sources and active unloading in sinks
Long-Distance Transfer: Xylem
Cohesion-Tension Hypothesis
Transstomatal Transpiration
Transcuticular Transpiration
Osmosis is diffusion through a membrane
When osmosis occurs, it is because of active transport
similar to guard cells; can accumulate or expel potassium
