Cell+Membraneg5

= The Cell Membrane! =

The cell membrane is a great addition to any cell! It is there to protect the cell, as a wall in a city might do. The major difference between a wall and a cell membrane is that the cell membrane is selectively permeable. Being selectively permeable means that it decides what should and should not enter, and how much. It acts like a filter in this way. There are two options as to how things get where there going within the cell, either it is active or passive. If it is passive, then it means the cell did it without expending energy, which will really save on the bills. If it is active it means it does use some energy. It is created with lipids and proteins, which both repel and attract each other, allowing the membrane to be selectively permeable. This is a unique function and your cell would not be complete without it.

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