Active and Passive 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.

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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, typically along a concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is endocytosis?

Back

Endocytosis is a form of active transport where cells engulf materials from the outside environment by forming a vesicle.

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What is exocytosis?

Back

Exocytosis is a process where cells expel materials by vesicles fusing with the cell membrane, releasing their contents outside the cell.

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What does permeable mean?

Back

Permeable means that a membrane allows certain substances to pass through it.

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane.

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What are protein pumps?

Back

Protein pumps are membrane proteins that actively transport ions or molecules against their concentration gradient using energy.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas, which drives the movement of molecules.

Front

What is the role of energy in active transport?

Back

Energy is required in active transport to move substances against their concentration gradient.