Simple diffusion and assisted diffusion are both forms of passive transport. They transfer materials from a region of high concentration to one with low concentration. The former, though, differs from the latter in how molecules are moved through the membrane.
Facilitated diffusion is a subset of passive transport. Even when aided diffusion includes transport proteins, it is still passive transport because the solution is moving down the concentration gradient. Small, nonpolar molecules can easily cross the cell membrane. Simple diffusion is one of the basic types of passive transport. Filtration, osmosis, and assisted diffusion make up the last three (also known as facilitated transfer). Each one shows a downward movement, or a change from a high concentration to a low concentration location.
Four categories of passive transportation exist:
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