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Cell membrane
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passive transport
The movement of a substance through a cell membrane without using the cell energy
Diffusion
The movement of a substance from an are of higher concentration to an are of lower concentration.
Facilitate diffusion
When molecules pass through a cell membrane using special proteins called transport proteins.
osmosis
Te diffusion of water molecules only through a membrane.
active transport
The movement of water through a cell membrane only by using cell energy.
Endocytosis
A cell takes in a substance by surrounding it with cell membrane
Exocytosis
a cells vasicles release their contents outside the cell.