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Cellular Diffusion
Beginning of essay
All cells have an outer protective casing, the cell membrane. It protects the cell from the outside world, but is also vital in the transfer of particles in and out of the cell. The cell membrane controls which particles can enter, and which particles can not, because it is selectively permeable. T ....
Middle of essay
....radient.
If a large molecule needs to be moved in or out of the cell, then two other processes, endocytosis and exocytosis are used. Endocytosis involves the cell membrane engulfing a foreign molecule and enclosing it in a vesicle inside the cell. Exocytosis involves the golgi body enclosing the substance to be exported into a vesicle, which then fuses with the cell membrane, and releases the substance outside the cell. Both endocytosis and exocytosis require energy.
Inside cells, inside the .... |
| Number of words: 595 |
Approximate pages: 3 |
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