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Diffusion/Facilitated Diffusion

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Across
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Movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
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Condition of balance in the body, reached when the tissues contain the proper proportions of various salts and water.
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To make easier
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Difference in the concentration of a substance from one location to another.
Down
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The diffusion of molecules across a membrane through transport proteins.
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Examples are oxygen (O2), nitrogen (N2), and ozone (O3). Others include carbon dioxide (CO2) and the organic molecules methane (CH4), toluene, and gasoline. Most carbon compounds are nonpolar. A notable exception is carbon monoxide, CO.
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An example of a transport protein