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Learning Targets “I Can. . .” -Define “selective permeability.” -Model a living cell by using eggs with a dissolved shell. -Predict the results of an experiment that involves the movement of water through a membrane. -Recognize cells that are in a hypotonic, hypertonic, and isotonic solution. Diffusion and Osmosis with Eggs Background • Some things can pass through the cell membrane and some things cannot; this is called selective permeability. • As chemicals pass into and out of a cell, they move from areas of high concentration to areas of low concentration. This process is called diffusion. • Water can also move into and out of the cell by osmosis. Modifications to Procedures • Goggles and aprons are NOT necessary • Use cups instead of beakers • Add enough vinegar to cover egg Results Elodea Cells Osmosis in Plant Cells Osmosis in Animal Cells Blood Cells Blood Cells Blood Cells