Cell Transport

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What is cell transport?

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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 passive transport?

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Passive transport is the movement of molecules across the cell membrane without the use of energy, typically moving from an area of high concentration to an area of low concentration.

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What is active transport?

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Active transport is the movement of molecules against their concentration gradient, from low to high concentration, requiring energy (usually in the form of ATP).

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What is diffusion?

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Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached.

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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 large or polar molecules cross the cell membrane.

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What is osmosis?

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

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What role do phospholipids play in the cell membrane?

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Phospholipids form the basic structure of the cell membrane, creating a bilayer that is hydrophilic on the outside and hydrophobic on the inside, allowing for selective permeability.

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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 portion of the cell membrane, forming a vesicle.

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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 is the function of membrane proteins?

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Membrane proteins assist in the transport of substances across the cell membrane, act as receptors for signaling, and provide structural support.