Cell Transport

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What is cell transport?

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Cell transport refers to the movement of substances across the cell membrane, which can occur through various mechanisms such as passive transport and active transport.

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What is passive transport?

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Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

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What is active transport?

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Active transport is the movement of substances across a cell membrane using energy, often against a concentration gradient.

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What is osmosis?

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Osmosis is 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 is diffusion?

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Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached.

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What is facilitated diffusion?

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Facilitated diffusion is a type of passive transport that uses protein channels to help move substances across the cell membrane.

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What is endocytosis?

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Endocytosis is the process by which cells take in substances by engulfing them in a membrane-bound vesicle.

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What is exocytosis?

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Exocytosis is the process by which cells expel substances by vesicles fusing with the cell membrane and releasing their contents outside the cell.

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What does 'concentration' mean in biology?

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Concentration refers to the number of molecules of a substance in a given volume.

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What is a concentration gradient?

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A concentration gradient is the difference in concentration of a substance across a space, which drives the movement of molecules.