Cell Membranes are composed of 2 Layers of

Cell Membranes are composed of 2 Layers of Phospholipids = Phospholipid Bilayer • 2 layers of phospholipids • Heads = love water • Tails = hate water • Middle = oily substance that keeps water out

Soap + Oil

Cell Membrane = Phospholipid Bilayer

The cell membrane is semi-permeable: allows substances to pass based on size DEMO!

What enters and exits cells? http: //www. teachersdomain. org/asset/tdc 02_int_membraneweb/ • Carbon Dioxide • Water • Oxygen • Glucose • Enzymes Small molecules can pass through the phospholipid bilayer; but how do the big molecules get into cells?

The Fluid Mosaic Model of The Cell Membrane • Fluid: moves easily • Mosaic: made of phospholipids, carbohydrates, protein channels

Cell Transport Jigsaw: • Each group will read about a different type of cell transport • You are to become an EXPERT in your topic. • While reading: • Pull out vocab words and define. • Take notes on important info. • Summarize the transport type. • You will then switch groups and become the teacher of that topic in your group. • You are fully responsible for the people in your group learning your section of notes. • Group 1: Diffusion • Group 2: Osmosis • Group 3: Facilitated Diffusion/Ion Channels • Group 4: Sodium Pumps • Group 5: Exo/Endocytosis