P ASSIVE AND A CTIVE T RANSPORT Notes

D EMO WITH AIR FRESHENER How do you think the scent reached your nose? Was the aroma stronger at one place that another? If so, why?

P ASSIVE T RANSPORT 3 types: Diffusion Osmosis Facilitated Diffusion

1. D IFFUSION Nutrients pass through cell membranes Travel down a concentration gradient (from high concentration to low concentration) no energy is required Moves until reaches equilibrium

D EMO FOOD COLORING

F OOD COLORING DEMONSTRATION Why does the food coloring travel throughout the water?

2. O SMOSIS Diffusion of water (high concentration to low concentration)

A CTIVE T RANSPORT Requires energy from cells Usually larger molecules Goes against the concentration gradient (from low to high)

Notes/diffusion-animated.gif s/lecgraphics/diffusion2.gif

P UT ON B OARD : S HOW ARROWS FOR DIFFUSION 1% sugar 5% sugar 3% sugar 1% sugar