The Cell: Part 6: Active Transport Flashcards
What is Active Transport?
Active Transport is the movement of molecules against a gradient.
Does active transport require energy?
Yes it does, because it is against the gradient.
What is an example of active transport?
A contractile vacuole in freshwater Protista like paramecia and amoeba pumps out excess water which diffuses water inwards because the organisms live in an environment that is hypotonic.
What are types of Active Transport?
- Endocytosis
- Exocytosis
What is Endocytosis?
Endocytosis is a process by which cells take in various molecules and particles by forming new vesicles made from the plasma membrane.
What are 3 examples of Endocytosis?
- Pinocytosis
- Phagocytosis
- Receptor mediated endocytosis.
What is Exocytosis?
Exocytosis is the active release of molecules from a cell.
Example of exocytosis..
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What is Pinocytosis?
Pinocytosis, also called cell drinking, is the uptake of large dissolved molecules.
How does Pinocytosis work?
The plasma membrane invaginates around tiny particles and encloses them in a vesicle.
What is Phagocytosis?
Phagocytosis is the engulfing of large particles or even small organisms by pseudopods.
How does Phagocytosis work?
The cell membrane wraps around the particles and encloses them, forming a vacuole.
What is an example of Phagocytosis.
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What does receptor mediated endocytosis enables the cell to do?
It enables the cell to take up large quantities of very specific substances.
How does receptor meditated endocytosis work?
Extracellular substances bind to specific receptors on the cell membrane and are drawn into the cell into vesicles.
