Cell Membrane and Transport Processes

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Hydrophobic

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Describes molecules or substances that repel water.

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Hydrophilic

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Describes molecules or substances that attract and interact with water.

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Semi-permeable

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A membrane that allows certain substances to pass through while blocking others.

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Passive transport

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

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Active transport

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The movement of substances across a cell membrane using energy.

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Diffusion

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

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Facilitated diffusion

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The process of spontaneous passive transport of molecules across a cell membrane via specific transmembrane proteins.

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Protein channel

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A protein that allows the transport of specific substances across a cell membrane.

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Hypertonic

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A solution with a higher concentration of solutes compared to another solution.

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Hypotonic

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A solution with a lower concentration of solutes compared to another solution.