CELL EGG INQUIRY LAB UNDERSTANDING THE CELL MEMBRANE

CELL (EGG) INQUIRY LAB UNDERSTANDING THE CELL MEMBRANE

Learning Targets Success Criteria Obtain information to understand osmosis & diffusion across cell membranes Prepare for the “Naked Egg” Lab to investigate the affects of different chemicals on cells

Video of Experiment

Initial Thoughts 1. 2. 3. Why did one egg shrink and the other grow? How do sponges work? Why do hospitals use rubber gloves and not cloth gloves?

RESEARCH Egg Anatomy • Eggs are cells, but big ones! • Most of a cell’s cytoplasm is water! • Cells have a cell membrane that controls what goes in and out.

Phet Simulation • Diffusion & Osmosis Phet Simulation Link • Use the blue diamonds to represent water and the green dots to represent salt • Add 20 of each to one side and only 20 blue diamonds to the other side • Add 2 blue open channels and 2 green open channels • What do you think will happen? Why? • Turn on the data graphs & watch their levels. • What do you notice? • What happens after 5 minutes? • COMPLETE YOUR MIDDLE CHECK

Diffusion, & Osmosis Diffusion Osmosis and Dialysis • Water moves from where there is A LOT to where there is LESS (this is called OSMOSIS) • Some small molecules (like Water & Oxygen) can go across freely; other things need “Help” getting across.

RESOURCES FOR UNDERSTANDING Cell membranes are “Semi-permeable” (Only some things can pass through. Small molecules cross easily but large molecules cannot) DIFFUSION OSMOSIS • https: //www. youtube. com/wa tch? v=Xxp 6 oponwkg • https: //www. youtube. com/wa tch? v=S_Y__0 q 0 SOU • https: //www. youtube. com/wa tch? v=e. Qs. Az. Xr 0 UCU • https: //www. youtube. com/wa tch? v=j. TDATla. BV-o DEFINITION: • When water moves from an area of high concentration to an area of low concentration • Can happen across cell membranes DEFINITION: • Similar to diffusion, BUT it’s the movement of water molecules from an area of low concentration to an area of high solute concentration (example salt water or sugar water).

Preparing for the Lab You should have basic understanding of Osmosis, Diffusion, and Semi-Permeable Membranes. You should have a lot of notes to refer to in case you feel stuck. *Complete your end check.