Diffusion and osmosis
Diffusion and osmosis occurs from "more to less"
- Small molecules consist of salt, water and glucose
Large molecules consist of starch, sucrose and urea
Diffusion >>
- a net movement of molecules from a higher concentration to a region of a lower concentration
- concentration is the number of particles
- when both sides are of the same concentration there would be no diffusion
- slow process
Osmosis >>
- occurs only for water
- dilute solution = more concentration of water
- concentrated solution = less concentration of water
- The net movement of water molecules from areas pf higher density to an area of lower concentration through a partially permeable membrane.”
- An Isotonic solution > is one with an equal water to solute concentration
- A Hyptotonic solution > is one with a higher concentration of water than the solution
- A Hypertonic solution > is one with a lower concentration of water than the solution
- PLUS
- Animal Cells that have
- too mush water - lysed
- same amount of water - normal
- too little water - shrivelled
- Plant Cells that have
- too much water - turgid
- same amount of water - flaccid
- too little water - plasmolysed
