Cell Transport

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What is cell transport?

Back

Cell transport refers to the movement of substances across the cell membrane, which can occur through various mechanisms such as diffusion, osmosis, and active transport.

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What is diffusion?

Back

Diffusion is the process by which small molecules move from an area of higher concentration to an area of lower concentration across a membrane.

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What is facilitated diffusion?

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Facilitated diffusion is the process by which large molecules cross the cell membrane through protein channels, moving from high to low concentration without energy.

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What is osmosis?

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Osmosis is the diffusion of water molecules across a selectively permeable membrane, moving from an area of low solute concentration to an area of high solute concentration.

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What is endocytosis?

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Endocytosis is the process by which cells engulf large molecules or particles by wrapping them in a membrane vesicle to bring them into the cell.

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What is exocytosis?

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Exocytosis is the process by which cells expel large molecules or particles by fusing a vesicle with the cell membrane, releasing its contents outside the cell.

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What role do proteins play in cell transport?

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Proteins act as channels or carriers that facilitate the transport of large or polar molecules across the cell membrane.

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What are phospholipids?

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Phospholipids are a type of lipid that make up the majority of the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

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What is the fluid mosaic model?

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The fluid mosaic model describes the structure of the cell membrane as a flexible layer of phospholipids with embedded proteins, allowing for movement and interaction.

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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 the movement of molecules during diffusion.