Passive vs Active Transport

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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. It occurs along the concentration gradient, from areas of higher concentration to areas of lower concentration.

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What is Active Transport?

Back

Active transport is the movement of substances across a cell membrane against the concentration gradient, requiring energy (usually in the form of ATP).

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Define 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 Exocytosis?

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Exocytosis is an active transport process where cells expel materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

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What does 'Low to High' refer to in transport mechanisms?

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'Low to High' refers to the movement of substances against the concentration gradient, characteristic of active transport.

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What is Osmosis?

Back

Osmosis is the passive transport 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 the concentration gradient?

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The concentration gradient is the difference in the concentration of a substance between two areas, which drives the movement of molecules during passive and active transport.

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What role do transport proteins play in facilitated diffusion?

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Transport proteins assist in the movement of specific molecules across the cell membrane during facilitated diffusion, allowing substances that cannot directly cross the membrane to enter or exit the cell.

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What is the difference between diffusion and osmosis?

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Diffusion is the movement of solutes from high to low concentration, while osmosis specifically refers to the movement of water across a membrane.

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What is an example of a substance that uses active transport?

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An example of a substance that uses active transport is sodium ions (Na+) being pumped out of a cell against their concentration gradient.