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Forums The Undercurrent it's literally just biology

Voltie Posted 5 years ago ( 2019/08/18 20:22:53 )

Apoplastic route - water/solutes move along continuum of cell walls and extracellular spaces

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Voltie Posted 5 years ago ( 2019/08/18 20:23:00 )

Symplastic route - water/solutes move along the continuum of cytosol (thru plasmodesmata)

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Voltie Posted 5 years ago ( 2019/08/18 20:23:06 )

Transmembrane route - water/solutes move out of one cell, across cell wall, into next cell

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Voltie Posted 5 years ago ( 2019/08/18 20:23:14 )

Selective permeability of plasma membrane, active/passive transport, pumps/transport proteins

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Voltie Posted 5 years ago ( 2019/08/18 20:23:23 )

H+ ions play primary role in basic transport (short-distance)

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Voltie Posted 5 years ago ( 2019/08/18 20:23:31 )

Proton pumps pump H+ out of plant cells to establish membrane potential

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Voltie Posted 5 years ago ( 2019/08/18 20:23:40 )

H+ cotransporter - movement of sugar/ion against its concentration gradient is coupled with movement of H+ down its electrochemical gradient (loads sucrose into phloem, nitrates into roots)

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Voltie Posted 5 years ago ( 2019/08/18 20:23:47 )

Gated ion channels open/close in response to chemicals, pressure, or voltage

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Voltie Posted 5 years ago ( 2019/08/18 20:23:55 )

Produce electrical signals (like animal action potentials), using Ca2+-activated ion channels

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Voltie Posted 5 years ago ( 2019/08/18 20:24:04 )

Water potential (Ѱ) - predicts movement of free water by osmosis (high → low)

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Voltie Posted 5 years ago ( 2019/08/18 20:24:14 )

Includes effects of solute concentration and physical pressure

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Voltie Posted 5 years ago ( 2019/08/18 20:24:21 )

Measured in megapascals. Ability of free water to do work

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Voltie Posted 5 years ago ( 2019/08/18 20:24:28 )

Pure water in a container open to the atmosphere under standard conditions (sea level, room temp) has Ѱ = 0 MPa

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Voltie Posted 5 years ago ( 2019/08/18 20:24:35 )

Internal pressure of a living plant cell due to osmotic uptake of water = 0.5 MPa

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Voltie Posted 5 years ago ( 2019/08/18 20:24:48 )

Water potential equation: Ѱ = ѰS + ѰP

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Voltie Posted 5 years ago ( 2019/08/18 20:24:56 )

Solute/osmotic potential (ѰS) - directly proportional to molarity, always negative

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Voltie Posted 5 years ago ( 2019/08/18 20:25:03 )

As solute concentration increases, ѰS decreases (more negative)

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Voltie Posted 5 years ago ( 2019/08/18 20:25:10 )

Pressure potential (ѰP) - physical pressure on a solution, positive or negative relative to atmospheric pressure

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Voltie Posted 5 years ago ( 2019/08/18 20:25:18 )

Water in living cells is under positive pressure to osmotic uptake of water

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Voltie Posted 5 years ago ( 2019/08/18 20:25:25 )

Protoplast (living part of cell and plasma membrane) presses against cell wall → turgor pressure

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