Osmosis, Water Potential & Tonicity
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5 Terms
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Define water potential (Ψ).
Ψ = pressure potential + solute potential; determines direction of water movement.
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What happens to a cell in a hypotonic solution?
Water enters → animal cell lyses, plant cell turgid.
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What happens to a cell in a hypertonic solution?
Water leaves → animal cell shrivels, plant cell plasmolyzes.
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What happens in an isotonic solution?
No net water movement; animal cells normal, plant cells flaccid.
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What is osmolarity regulation (osmoregulation)?
Process of controlling solute concentrations and water balance (e.g., contractile vacuole in paramecium).
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