Active transport
Definition
Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration using energy, typically in the form of ATP. This process is essential for maintaining cellular homeostasis.
5 Must Know Facts For Your Next Test
- Active transport requires energy input, usually from ATP.
- It moves substances against their concentration gradient, from low to high concentration.
- Transport proteins such as pumps are involved in active transport.
- The sodium-potassium pump is a classic example of active transport in cells.
- Active transport is crucial for regulating intracellular concentrations of ions and nutrients.
Review Questions
- What type of energy is commonly used in active transport?
- How does active transport differ from passive transport?
- Name a specific example of a pump involved in active transport.
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Related terms
Passive Transport: Movement of molecules across cell membranes without energy input.
Sodium-Potassium Pump: A protein that uses ATP to exchange sodium ions out of and potassium ions into the cell.
ATP (Adenosine Triphosphate): The primary energy carrier in living organisms.
