2.15 Diffusion, Osmosis & Active transport Flashcards
What is diffusion?
The movement of molecules from a region of higher concentration to lower concentrations
What is an example of diffusion in living organisms?
Molecules entering and leaving cells through diffusion when they cross the cell membrane
What is osmosis?
The movement of water molecules from a region of high water concentration to lower water concentrations through a partially permeable membrane
What is active transport?
The movement of particles across a cell membrane from a region of low concentration to high concentration
Why is energy needed for active transport?
Energy is needed because molecules are being moved against a concetration gradient
How does the concentration gradient affect the rate of diffusion?
The greater the difference in concentration gradient between the two regions, the quicker the overall rate of diffusion is.
How does the temperature affect the rate of diffusion?
-The higher the temperature the more movement will happen
-With higher temperatures the rate of diffusion will be higher
How does the amount of surface area affect the rate of diffusion?
A membrane with more surface area will have more diffusion happening
