Cell Transport

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

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What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, occurring along the concentration gradient (from high to low concentration).

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane without energy, typically for larger or polar molecules.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules during diffusion.

Front

What is the role of ATP in active transport?

Back

ATP provides the energy required for active transport to move molecules against their concentration gradient.

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What is co-transport?

Back

Co-transport is a type of active transport where two substances are simultaneously transported across a membrane, one moving down its gradient and the other against its gradient.

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Why do cells need to transport nutrients?

Back

Cells need to transport nutrients to produce energy, support cellular functions, and maintain homeostasis.

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What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell in vesicles.

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What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles, releasing them into the external environment.