Biology: Cell Transport

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What is Active Transport?

Back

The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

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What is Passive Transport?

Back

The movement of molecules across a cell membrane without the use of energy, typically from a region of higher concentration to a region of lower concentration.

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What is Endocytosis?

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A process by which cells take in substances by engulfing them in a membrane.

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What is Exocytosis?

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The process by which a cell expels materials in vesicles that fuse with the cell membrane.

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What does selectively permeable mean?

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A property of cell membranes that allows some substances to pass through while blocking others.

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What is the function of the Cell Membrane?

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To protect the cell and regulate what enters and exits the cell.

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What is the difference between Active and Passive Transport?

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Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

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What is Osmosis?

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The diffusion of water across a selectively permeable membrane.

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What is a Concentration Gradient?

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A difference in the concentration of a substance across a space or membrane.

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What is the role of Mitochondria in cell transport?

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Mitochondria produce ATP, which provides the energy needed for active transport processes.