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 diffusion, osmosis, and active transport.

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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 from ATP) to move molecules from an area of low concentration to an area of high concentration.

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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, occurring along the concentration gradient from high to low concentration.

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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 protein channels to help move substances across the cell membrane from an area of high concentration to an area of low concentration.

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What are protein pumps?

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Protein pumps are integral membrane proteins that actively transport ions or molecules across the cell membrane against their concentration gradient, using energy.

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What is endocytosis?

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Endocytosis is the process by which cells engulf substances from the outside environment, forming a vesicle to bring them into the cell.

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What is exocytosis?

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Exocytosis is the process by which cells expel materials in vesicles, fusing with the cell membrane to release their contents outside the cell.

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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, crucial for maintaining cellular function.

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What is diffusion?

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Diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.