Presentation on theme: "Cellular Transport How cells interact with the outside world Chapter 7-3 Pgs. 184 - 189."— Presentation transcript:
Cellular Transport How cells interact with the outside world Chapter 7-3 Pgs. 184 - 189
Movement WITH the concentration gradient Stuff moves from high to low concentration
occurs until equilibrium is reached BOOSH! Equilibrium
Getting across a cell membrane Passive transport – Simple diffusion – Osmosis – Facilitated diffusion Active transport Passive transport – Simple diffusion – Osmosis – Facilitated diffusion Active transport
Can Semi Permeable barriers really exist? Can a barrier really be choosy about what it does and doesnt let through? 1.Did the Iodine interact with the Cornstarch? 2.Will the water move in or out of the bag 3.Did the cornstarch move with it? 4.What is this bag permeable to? 5.What does this bag select against?
Simple diffusion Small, non-polar molecules without a charge can squeeze through the cell membrane without the help of protein channels. Flows with the concentration gradient
movement of larger molecules like glucose through the cell membrane – larger molecules must be helped Proteins in the cell membrane form channels for large molecules to pass through Proteins that form channels (pores) are called protein channels outside of cell inside of cell Glucose molecules Facilitated Diffusion