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DEMO WITH AIR FRESHENER
How do you think the scent reached your nose?
Was the aroma stronger at one place that another? If so, why?
1. DIFFUSIONNutrients pass through cell membranes
Travel down a concentration gradient (from high concentration to low concentration)
no energy is requiredMoves until reaches equilibrium
FOOD COLORING DEMONSTRATION
Why does the food coloring travel throughout the water?
http://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gif
ACTIVE TRANSPORTRequires energy from cellsUsually larger moleculesGoes against the concentration gradient (from low to high)
http://legacy.owensboro.kctcs.edu/GCaplan/anat/Notes/diffusion-animated.gif
http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion2.gif
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