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Transport across Plasma Membranes In cells there are many ways in which molecules can enter and leave cells, these include, Osmosis, diffusion, active transport, exocytosis etc... You may consider that each cell had one plasma membranes which was used to cover the cell and keep everything in, nothing else. This is not true, as structures inside the cells also have plasma membranes, these include endoplasmic reticulums, mitochondria, chloroplasts and there are many more. Also plasma membrane control what goes in and out of the cell. When you may have drawn a cell, you would have drawn the plasma membrane as a straight line, but this is not what it's really like. As it consists of phospholipid bilayer, which means that is has two layers of phospholipid molecules, as you can see from the diagram below, The diagram of a plasma membrane is called...

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