4 Questions
What is the main difference between passive transport and active transport?
Passive transport does not require energy, while active transport does.
Which process is an example of passive transport?
Diffusion
Why does active transport require energy?
To move particles from an area of lower concentration to an area of higher concentration.
In which type of cells would active transport be particularly important for function?
Heart muscle cells
Study Notes
Transport Across Cell Membranes
- The main difference between passive transport and active transport is the direction of transport and the requirement of energy.
Passive Transport
- Passive transport is the movement of molecules from an area of higher concentration to an area of lower concentration, without using energy.
- Example: Osmosis, the movement of water molecules through a selectively permeable membrane into a solution with higher solute concentration.
Active Transport
- Active transport is the movement of molecules from an area of lower concentration to an area of higher concentration, requiring energy.
- Energy is required to pump molecules against their concentration gradient.
- Important in cells that need to maintain specific internal environments, such as nerve cells, which require high concentrations of certain ions to transmit signals.
Cell Function and Active Transport
- Active transport is particularly important for function in cells that require specific internal environments, such as nerve cells, to maintain their function.
- In these cells, active transport helps maintain the necessary ion balance and concentration gradients.
Test your knowledge of cell transport with this quiz! Explore the concepts of passive transport, including diffusion, and enhance your understanding of how substances move in and out of cells without the input of energy.
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