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ZOOLOGY LAB B MODULE 3 Introduction: The cell is universally considered to be 'alive' and being such, it performs fundamental life functions and processes. Cells 'eat', 'digest', 'excrete', communicate, reproduce, adapt to their environment, move, or change shape. One basic example of process performed at the cellular level is osmosis. Osmosis is the diffusion of water through a semipermeable membrane based on the concentration gradient of water across the membrane. - Diffusion of water across a differentially selectively permeable membrane due to concentration differences. - Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane and the membrane mbrane limits the diffusion of solutes in the water. - Osmosis is a special case of diffusion. In animal cells, the classic demonstration of osmosis and osmotic pressure is to immerse the cells in solutions of varying osmolarity and watch what happens under the compound microscope. This laboratory exercise will demonstrate this perspective.