Exchange with the Environment

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Presentation transcript:

Exchange with the Environment

The Cell Membrane The exchange of materials between a cell and its environment takes place at the cell’s membrane.

Diffusion Particles naturally travel from areas where they are crowded to areas where they are less crowded High concentration  low concentration

Diffusion Diffusion: movement of particles from an area of high concentration to low concentration. Can occur across cell membranes or outside of cells Cells do not need to use any energy for diffusion to occur

Osmosis Cells and living organisms are surrounded by and filled with fluids that are made mostly of water Osmosis: diffusion of water ACROSS the CELL MEMBRANE

Osmosis http://www.youtube.com/watch?v=sdiJtDRJQEc

Cells and Osmosis Cells constantly exchange materials, such as water, salts and sugars, through the process of osmosis Ex: red blood cells in plasma