Passive 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, moving from an area of high concentration to an area of low concentration.

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What is diffusion?

Back

Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

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What does selectively permeable mean in relation to cell membranes?

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Selectively permeable means that a cell membrane regulates which substances can enter and exit the cell.

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What is the role of a semi-permeable membrane?

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A semi-permeable membrane allows certain substances to pass through while blocking others, thus controlling the movement of materials in and out of the cell.

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What is osmosis?

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Osmosis is the diffusion of water molecules through 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.

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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.

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What is the difference between passive transport and active transport?

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Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

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What is an example of diffusion in everyday life?

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An example of diffusion is the smell of perfume spreading in a room.

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What is the significance of cell membranes being fluid?

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The fluid nature of cell membranes allows for the movement of proteins and lipids within the membrane, facilitating cell communication and transport.