Movement of Substances Into and Out Of Cells Flashcards
Diffusion
The net movement of molecules from an area of high concentration to an area of low concentration
Active transport
The movement of molecules against the concentration gradient using energy from respiration
Osmosis
The net movement of water molecules from an area of high water potential to an area of low water potential
Diffusion happens more quickly
Greater concentration gradient
Larger surface area in proportion to volume
Increase the rate of diffusion
The rate of diffusion is decreased
Greater distance over which diffusion has to take place
Higher temperatures
The rate of diffusion increases because the particles have more kinetic energy
Describe an experiment to measure the effect of a factor upon rate of diffusion
- Cut a cube of Agar jelly dyed with potassium permanganate from a petri dish
- Drop the cube into a beaker of dilute hydrochloride acid
- Note the time taken for the cube to turn colourless
- Repeat and average
- Change the independent variable and repeat