Cell Transport

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What is Active Transport?

Back

A process that moves molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy.

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What is Diffusion?

Back

The movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy.

Front

What is Facilitated Diffusion?

Back

A process that allows molecules to cross the membrane with the assistance of special proteins, moving from high to low concentration without energy.

Front

What is Osmosis?

Back

The diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What does 'Homeostasis' mean?

Back

The ability of a cell or organism to maintain a stable internal environment despite changes in external conditions.

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What is Endocytosis?

Back

A process by which cells take in substances by engulfing them in a membrane.

Front

What is Exocytosis?

Back

The process by which a cell expels materials in vesicles that fuse with the cell membrane.

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What is Concentration?

Back

The number of molecules of a substance in a given volume.

Front

What is a Selectively Permeable Membrane?

Back

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

Front

What is the role of transport proteins?

Back

Proteins that help move substances across a cell membrane, either passively or actively.