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Movement of water from high concentration to low concentration. The net movement of water from dilute to a concentrated solution through a partially permeable membrane.

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Energy from ATP is used to move a particle through a protein against the direction of diffusion.

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Large and polar molecules can't get across the membrane via simple diffusion.

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Amount of water transported into the cell equal to the amount of water transported out from the cell. Solute concentration inside of the cell is equal to the solution outside the cell.

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Describes a solution that has a higher solute concentration than another solution. (higher water potential)

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Describes a solution that has a higher solute concentration than another solution.
Water particles will move out of the cell, causing the cell to shrivel.

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Substances diffuse down their concentration gradient.

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The membrane is selectively permeable because it allows certain particles to pass through, while others cannot.

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The condition in which all acting influences are balanced or canceled by equal opposing forces, resulting in a stable system.

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A particle in an area of high concentration diffuses though a protein.

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No energy is used to make the molecules to move.  As the dye starts in one place, these random movements will slowly spread out until an equilibrium is reached.

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Buffer solutions consist of mixtures of a weak acid or base and its salt.
buffer system consists of a weak acid and its salt mixture.

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Maintaining stable internal conditions such as the body temperature, blood sugar and blood pressure.

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pH scale is a way of measuring the acidity of a substance whether it is a base or an acid. Also provides a means for comparing relative concentrations of hydroxide and hydronium ions.