1. Facilitated Difusion Do Now 1.Get out last night’s homework 2.Start filling out your passive transport graphical organizer. Type 1 is diffusion, and type 2 is osmosis (notice there’s 3 situations)

2. Passive Transport Q: How is osmosis related to diffusion? A: They are both types of passive transport. PASSIVE TRANSPORT: the movement of molecules from areas of high concentration to low WITHOUT any energy use by a cell.

3. Concentration Gradient A concentration gradient is a difference in concentration across a space. Going “down” the concentration gradient means moving from an area of high concentration to low High ConcentrationLow Concentration “down” the gradient 

5. These things go together: Moving from high to low concentration happens spontaneously: NO ENERGY REQUIRED! Diffusion and osmosis are examples. This is passive transport.

6. The last piece of the passive transport puzzle: facilitated diffusion fa·cil·i·tate –verb (used with object), -tat·ed, -tat·ing. 1.to make easier or less difficult; help forward (an action, a process, etc.): Careful planning facilitates any kind of work. 2.to assist the progress of (a person). So what do you think facilitated diffusion is?

7. Facilitated Diffusion Membrane Proteins Solutes too big Or too polar To diffuse normally

8. Passive Transport Definition: Key Term: Isotonic: Solute conc. = Inside & out. No net H2O change. Type 1 Type 2 Type 3 Required for And

9. Passive Transport Definition: The process of substances passing through the cell membrane WITHOUT ANY INPUT OF ENERGY BY THE CELL. Definition: Solute molecules move from an area of high concentra- tion to an area of low conc. Powered by the random motion of molecules. Definition: Cell uses carrier proteins in membrane to allow the diffusion of molecules that can’t pass through membrane alone. Definition: Diffusion of water from an area of high H2O conc. (low solute conc.) to low (high solute conc.) Key Term: Isotonic: Solute conc. = Inside & out. No net H2O change. Type 1 Type 2 Type 3 Required for And DIFFUSION OSMOSISFACILITATED DIFFUSION Equilibrium Hypertonic: Solute conc. Bigr outside. H2O out Hypotonic: Solute conc. Lower outside. H2O in. Hypo-Hippo Ions (charged molecules) Large Molecules

10. One Final Idea: Dynamic Equilibrium Dynamic = changing (think music) Molecules are in constant motion. Equilibrium doesn’t mean standing still – it means equal amounts of forward and backward motion