Passive and Active Transport Across the Cell Membrane

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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. It occurs naturally due to concentration gradients.

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What is Active Transport?

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Active transport is the movement of substances across a cell membrane using energy, usually against a concentration gradient.

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What is Endocytosis?

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Endocytosis is the process by which a cell takes in materials by engulfing them with its cell membrane, forming a vesicle.

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What is Exocytosis?

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Exocytosis is the process by which a cell expels materials by vesicles fusing with the cell membrane, releasing their contents outside.

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What is Diffusion?

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Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

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What is Osmosis?

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Osmosis is the diffusion of water 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 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 a Concentration Gradient?

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A concentration gradient is the difference in the concentration of a substance across a space, which drives diffusion.

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What is a Vesicle?

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A vesicle is a small, membrane-bound sac that transports materials within a cell or to the cell membrane.

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What is the role of the Cell Membrane?

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The cell membrane controls what enters and exits the cell, maintaining homeostasis and protecting the cell's internal environment.