Final Fridays - U3 - Cell Transport

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What is active transport?

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Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

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What is passive transport?

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Passive transport is the movement of molecules across a cell membrane without the use of energy, occurring along the concentration gradient.

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What is osmosis?

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Osmosis is the movement 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 is diffusion?

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Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.

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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, releasing their contents outside the cell.

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What is endocytosis?

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Endocytosis is the process by which a cell engulfs materials from the outside environment, forming a vesicle that brings substances into the cell.

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What does isotonic mean?

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Isotonic refers to a solution that has the same solute concentration as another solution, resulting in no net movement of water across a membrane.

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What is a selectively permeable membrane?

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A selectively permeable membrane is a barrier that allows certain substances to pass through while blocking others, crucial for maintaining homeostasis in cells.

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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 without energy.

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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 molecules during diffusion and osmosis.