Today’s Data Here Objective Here!

Brainteaser What word in the English language is always spelled incorrectly?

A potato slice is placed in distilled water in beaker 1 A potato slice is placed in distilled water in beaker 1. A similar potato slice is placed in salt water in beaker 2. Which statement correctly explains the movement of water across cell membranes in one of the potato slices? Water will move out of the potato cells in beaker 1 because the solution is more concentrated. Water will move into the potato cells in beaker 1 because the solution is more concentrated. Water will move out of the potato cells in beaker 2 because the solution is more concentrated. Water will move into the potato cells in beaker 2 because the solution is more concentrated.

Let’s Review What is Osmosis? What are the 3 types of solutions associated with osmosis? What are the following solutions and which way will the water move? 25% NaCl 25% NaCl 5% NaCl 35% NaCl

Cellular Transport Diffusion

Today you will learn Explain Diffusion Explain what is meant by Facilitated Diffusion

Passive Transport: 2. Diffusion Diffusion: random movement of particles from an area of high concentration to an area of low concentration. (High to Low) Diffusion continues until all molecules are evenly spaced (equilibrium is reached)-Note: molecules will still move around but stay spread out. http://bio.winona.edu/berg/Free.htm

Facilitated diffusion (Channel Protein) Diffusion (Lipid Bilayer) Passive Transport: 3. Facilitated Diffusion A B 3. Facilitated diffusion: diffusion of specific particles through transport proteins found in the membrane Transport Proteins are specific – they “select” only certain molecules to cross the membrane Transports larger or charged molecules Facilitated diffusion (Channel Protein) Diffusion (Lipid Bilayer) Carrier Protein http://bio.winona.edu/berg/Free.htm

Passive Transport: 2. Facilitated Diffusion Glucose molecules Cellular Transport From a- High High Concentration Channel Proteins animations Cell Membrane Low Concentration Protein channel Low Transport Protein Through a 

How well did you do today? Molecules move from areas of high concentration to areas of low concentration through the process of: osmosis. diffusion. passive transport. active transport.