1. M EMBRANE T RANSPORT

2. T YPES OF T RANSPORT Does not require any energy to move molecules across membrane Transport proteins and carrier proteins are used to help move molecules across the cell membrane. Solutes moving in their natural direction require no energy. Ex. Moving from high to low concentration Does not require any energy to move molecules across membrane Transport proteins and carrier proteins are used to help move molecules across the cell membrane. Solutes moving in their natural direction require no energy. Ex. Moving from high to low concentration Requires energy to move molecules across the cell membrane. Moves solute against natural direction Ex. Moving low to high concentration ATP is needed to pump the solute out Proteins are pumps. Requires energy to move molecules across the cell membrane. Moves solute against natural direction Ex. Moving low to high concentration ATP is needed to pump the solute out Proteins are pumps. Passive Transport Active Transport

3. P ASSIVE T RANSPORT

4. Requires no energy from the cell Diffusion Osmosis Facilitated diffusion

5. W HAT IS DIFFUSION ? Diffusion is the movement of molecules from a high to low concentration. Example: Perfume diffusing through the air. The perfume is more concentrated inside the bottle when sprayed will spread out into the air in which the molecules move from the high concentration to low concentration.

6. L OOK The food coloring is diffusing through the water. food color diffusion http://www.youtube.com/watch?v=STLAJ H7_zkY

7. D IFFUSION A CROSS THE C ELL M EMBRANE Only a few molecules can pass though the lipid bilayer easily with no assistance. Molecules that are small and lipid soluble such as: Steroids Water Oxygen Carbon dioxide

8. F ACILITATED DIFFUSION Some molecules and ions such as glucose, sodium ions and chloride ions are unable to pass through the lipid bilayer of the cell membrane and have to go through channels. Through the use of channel, transport and carrier proteins that are embedded in the cell membrane these substance can be transported into the cell.

9. C HANNEL P ROTEINS Form a water filled pore or channel in the membrane. Allow specific ions to pass through the protein channel. The ion channels are regulated by the cell and are either open or closed to control the passage of substances into the cell.

10. T RANSPORT P ROTEINS Specific to one type of molecule Substances may only pass if it contains that certain molecule specific to that transport protein

11. C ARRIER P ROTEIN Bind to specific molecules, change shape and then deposit the molecules across the membrane Molecule will bind to the side of higher concentration and be moved to area of lower concentration. Once the transaction is complete the proteins return to their original position.

12. W HAT DOES F ACILITATED T RANSPORT LOOK LIKE ? facilitated transport

13. S UMMARY OF D IFFUSION

14. R EFERENCES http://youtu.be/I4123hUU8xo en.wikipedia.org/wiki/ Cell_Membrane en.wikipedia.org/wiki/ Passive_transport www.biology4kids.com/files/cell2_ passive tran.h tml www.emc.maricopa.edu/faculty/farabee/biobk/ BioBooktransp.html www.wiley.com/college/pratt/0471393878/stude nt/animations/ membrane _ transport /index.ht ml