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Questions and Answers
What is active transport?
What is active transport?
Active transport
Water moves via osmosis _________.
Water moves via osmosis _________.
from an area with a high concentration of water to one of lower concentration
What does passive transport not use for entry into a cell?
What does passive transport not use for entry into a cell?
A transport protein
Why must active transport function continuously?
Why must active transport function continuously?
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Which transport mechanism can bring whole cells into a cell?
Which transport mechanism can bring whole cells into a cell?
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Study Notes
Active Transport
- Involves the movement of molecules against their concentration gradient using energy, typically ATP.
- Essential for maintaining concentration differences across the plasma membrane.
Osmosis
- Water moves via osmosis from regions of high water concentration to regions of low water concentration.
- This process is vital for maintaining cell turgor and overall homeostasis.
Passive Transport
- Oxygen can enter a cell through passive transport processes without the aid of transport proteins, especially following oxygen deprivation.
- This process occurs naturally due to concentration gradients, enabling gas exchange.
Continuous Function of Active Transport
- Active transport mechanisms must operate continuously to counteract diffusion, which allows solutes to move randomly in all directions.
- Maintaining cellular concentrations of ions and nutrients relies on the continuous activity of these transport systems.
Phagocytosis
- A specific form of active transport that enables cells to engulf whole particles or other cells.
- Particularly important for immune responses and nutrient uptake in unicellular organisms.
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