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HomeHomework HelpbiologyActive Transport

Active Transport

Active transport is the process by which cells move molecules across their membrane against a concentration gradient, utilizing energy in the form of adenosine triphosphate (ATP) to facilitate this movement. This mechanism is essential for maintaining cellular homeostasis and enabling the uptake of necessary substances.

intermediate
2 hours
Biology
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Overview

Active transport is a vital cellular process that enables the movement of substances against their concentration gradients, requiring energy input, typically from ATP. This mechanism is crucial for maintaining homeostasis and ensuring that cells can uptake necessary nutrients and expel waste product...

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Key Terms

Active Transport
The movement of molecules across a cell membrane using energy.

Example: Sodium-potassium pump is a classic example of active transport.

Concentration Gradient
A difference in the concentration of a substance across a space.

Example: Substances move from high to low concentration in passive transport.

ATP (Adenosine Triphosphate)
The energy currency of the cell, used in various cellular processes.

Example: Cells use ATP to power active transport mechanisms.

Transport Proteins
Proteins that assist in the movement of substances across a cell membrane.

Example: Glucose transporters help move glucose into cells.

Primary Active Transport
Active transport that directly uses ATP to transport molecules.

Example: The sodium-potassium pump is an example of primary active transport.

Secondary Active Transport
Active transport that uses the energy from the movement of one molecule to transport another.

Example: Glucose is transported into cells using the sodium gradient.

Related Topics

Passive Transport
The movement of molecules across a cell membrane without the use of energy.
beginner
Cell Membrane Structure
The arrangement and function of components in the cell membrane.
intermediate
Endocytosis and Exocytosis
Processes by which cells take in and release large molecules.
intermediate

Key Concepts

Energy UseConcentration GradientTransport ProteinsCell Membrane