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Diffusion/Facilitated Diffusion

Horizontales
Movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
Condition of balance in the body, reached when the tissues contain the proper proportions of various salts and water.
To make easier
Difference in the concentration of a substance from one location to another.
Verticales
The diffusion of molecules across a membrane through transport proteins.
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.
An example of a transport protein