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 passive or active mechanisms.

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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 against their concentration gradient, requiring energy (usually in the form of ATP).

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What is osmosis?

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Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What are aquaporins?

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Aquaporins are specialized protein channels in the cell membrane that facilitate the rapid transport of water molecules.

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What is endocytosis?

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Endocytosis is a form of active transport where the cell membrane engulfs material to bring it into the cell.

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What is exocytosis?

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

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What is a phospholipid bilayer?

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A phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing structure and a barrier to the passage of substances.

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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 the concentration gradient?

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The concentration gradient is the difference in the concentration of a substance across a space, driving the movement of substances during diffusion.