Transport Mechanisms in Cells

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Passive Transport

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The movement of substances across a cell membrane without the use of energy by the cell.

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Active Transport

Back

The movement of substances across a cell membrane using energy, typically against a concentration gradient.

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Diffusion

Back

The process by which molecules spread from areas of high concentration to areas of low concentration.

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Dynamic Equilibrium

Back

A state of balance between continuing processes, where the rate of loss is equal to the rate of gain.

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Osmosis

Back

The diffusion of water through a selectively permeable membrane.

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Facilitated Diffusion

Back

The process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.

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Transport Protein

Back

Proteins involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.

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Concentration Gradient

Back

A difference in the concentration of a substance across a space.

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Hypotonic Solution

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A solution that has a lower concentration of solutes compared to another solution.

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Isotonic Solution

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A solution that has the same concentration of solutes as another solution.