- Slides: 14
Osmosis & Diffusion Ms. Simms Biology
Diffusion: �What is the tendency of all molecules? �What causes this tendency?
Diffusion continued… �What is the general movement of molecules as they diffuse? �What direction will they move in? �What is this general direction of molecules called? Hint concentrations!!
Passive Transport �What is passive transport? �What causes this movement? �Where will the molecules in the image travel if there are no molecules outside of the cell?
�Once the number of molecules are balanced inside and outside of the cell, what will happen to the movement of molecules?
�What does membrane permeability mean? �What does a semi-permeable or selectively permeable membrane mean? �What does facilitated diffusion do for the movement of cells across membranes?
Facilitated diffusion involves the use of a protein to transport molecules across the cell membrane. �Facilitated diffusion is a type of _______. �What does facilitated diffusion use to help transport molecules across membranes? �What are some molecules that are unable to pass through the lipis bilayer of cell membranes? (Name
�What is the use of ion channel proteins? �What id the use of carrier proteins? �What protein opens or closes the membrane to control the passage of substances into the cell.
�Carrier proteins bind to specific molecules, change shape and then deposit the molecules across the membrane. Once the transaction is complete the proteins return to their original position.
�Osmosis is a special case of _________. �What is the movement between a hypotonic solution and a hypertonic solution. �What determines the direction of water flow? �If the blood cells in the image above are placed in salt water solutions of different concentrations, the following will occur:
�What does a hypertonic salt solution mean? �What direction will the water flow? �What is a result of a blood cell in a salt solution? �What will happen to its size?
�What does isotonic mean? �What direction is the movement of fluid? �What is an example of a isotonic solution? �What will happen to the size of the blood vessel?
�What is a hypotonic solution? �What is the concentration of salt ompared to the other membrane wall? �What direction will the fluid move? �What will happen to the size of the blood vessel? �What is it called when a blood vessel bursts?
Reference �http: //biology. about. com/od/cellularprocesses/ss/diffusion. htm