PASSIVE AND ACTIVE TRANSPORT

Notes

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?

PASSIVE TRANSPORT3 types:

DiffusionOsmosisFacilitated Diffusion

1. DIFFUSIONNutrients pass through cell membranes

Travel down a concentration gradient (from high concentration to low concentration)

no energy is requiredMoves until reaches equilibrium

DEMO FOOD COLORING

FOOD COLORING DEMONSTRATION

Why does the food coloring travel throughout the water?

http://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gif

2. OSMOSISDiffusion of water (high concentration to low concentration)

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

PUT ON BOARD: SHOW ARROWS FOR DIFFUSION

1% sugar

5% sugar

3% sugar

1% sugar

1% sugar

1% sugar