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Science, Grade 6


Table Of Contents: Diffusion

1. Function of Diffusion
Organisms use the process of diffusion to allow useful molecules to enter the cells and remove waste products.
2. What Is Diffusion?
Diffusion is the movement of a gas or solute molecules from an area where there are many to an area where there are few until they spread evenly throughout a space. This movement can occur across a cell membrane or outside of cells.
3. Oxygen Diffusion in the Lungs
For example, the high concentration of oxygen in the lung’s air sacs moves to a lower concentration in the blood while carbon dioxide moves from an area of high concentration in the blood to a lower concentration in the air sacs.
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