Tonicity - turgid . Hypertonic solution A hypertonic...

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Tonicity Tonicity refers to the relative concentration of solute on either side of a membrane. Isotonic In an isotonic solution, the concentration of solute is the same on both sides of the membrane (inside the cell and outside). A cell placed in an isotonic solution neither gains or loses water. Most cells in the body are in an isotonic solution. Hypotonic A hypotonic solution is one that has less solute (more water). Cells in hypotonic solution tend to gain water. Animal cells can lyse (rupture) in a hypotonic solution due to the osmotic pressure. Freshwater organisms live in a hypotonic solution and have a tendency to gain water. The contractile vacuole in freshwater protozoans removes water that enters the cell. The cell wall of plant cells prevents the cell from rupturing. The osmotic pressure, called turgor pressure , helps support the cell. A cell in which the contents are under pressure is
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Unformatted text preview: turgid . Hypertonic solution A hypertonic solution is one that has a high solute concentration. Cells in a hypertonic solution will lose water. The marine environment is a hypertonic solution for many organisms. They often have mechanisms to prevent dehydration or to replace lost water. Animal cells placed in a hypertonic solution will undergo crenation, a condition where the cell shrivels up as it loses water. Plant cells placed in a hypertonic solution will undergo plasmolysis , a condition where the plasma membrane pulls away from the cell wall as the cell shrinks. The cell wall is rigid and does not shrink. Left: These Elodea cells were placed in a 10% NaCl solution. The contents of the cells was reduced but the cell walls remained intact. Compare these cells to normal cells in the photograph below. Left: Normal Elodea cells X 400 ....
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Tonicity - turgid . Hypertonic solution A hypertonic...

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