Cell Membrane and Cell Transport

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What is the cell membrane?

Back

The cell membrane is a biological barrier that separates the interior of a cell from its external environment, controlling the movement of substances in and out of the cell.

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What is passive transport?

Back

Passive transport is the movement of molecules across the cell membrane without the use of energy, moving from areas of high concentration to areas of low concentration.

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What is active transport?

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Active transport is the movement of molecules across the cell membrane using energy, moving from areas of low concentration to areas of high concentration.

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What is homeostasis?

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Homeostasis is the process by which a cell or organism maintains a stable internal environment despite changes in external conditions.

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What role does passive transport play in homeostasis?

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Passive transport helps maintain homeostasis by allowing essential molecules to enter and exit the cell according to concentration gradients.

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What role does active transport play in homeostasis?

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Active transport helps maintain homeostasis by moving molecules against their concentration gradient, ensuring that essential substances are retained within the cell.

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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, which drives the movement of molecules during transport.

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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, a type of passive transport.

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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 low solute concentration to an area of high solute concentration.

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What is facilitated diffusion?

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Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane.