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What is active transport?

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Active transport is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.

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What is passive transport?

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Passive transport is the movement of particles across a cell membrane without the use of energy, typically from a region of higher concentration to a region of lower concentration.

Tags

NGSS.MS-LS1-2

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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 osmosis?

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Osmosis is the diffusion of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.

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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.

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What is exocytosis?

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Exocytosis is the process by which cells expel materials in vesicles that fuse with the cell membrane.

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What is the sodium-potassium pump?

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The sodium-potassium pump is an active transport mechanism that moves sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Tags

NGSS.HS-LS1-3

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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.

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What is the role of ATP in active transport?

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ATP provides the energy required for active transport processes to move substances against their concentration gradients.

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What is a concentration gradient?

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A concentration gradient is the difference in the concentration of a substance between two areas.