Cellular Transport

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What is cellular transport?

Back

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

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Define concentration gradient.

Back

A concentration gradient is the difference in the concentration of a substance between two areas, typically across a membrane.

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What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, moving from an area of high concentration to an area of low concentration.

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What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, from low to high concentration, requiring energy (ATP) and often involving transport proteins.

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What is diffusion?

Back

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 osmosis?

Back

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 down their concentration gradient.

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What is exocytosis?

Back

Exocytosis is the process by which cells export materials using vesicles that fuse with the plasma membrane to release their contents outside the cell.

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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 vesicle formed from the cell membrane.

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What does isotonic mean?

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Isotonic refers to a solution where the solute concentration is equal inside and outside the cell, resulting in no net movement of water.