Cells/The Plasma Membrane
|The Anatomy and Physiology of Animals|
|The cell||Introduction | The Plasma Membrane | The Cytoplasm | The Nucleus | Cell Division | Summary|
The Plasma Membrane
The thin plasma membrane surrounds the cell, separating its contents from the surroundings and controlling what enters and leaves the cell. The plasma membrane is composed of two main molecules, fats (in fact phospholipids) and proteins. The fats are arranged in a double layer with the large protein molecules dotted about in the membrane (see diagram 3.4). Some of the protein molecules form tiny channels in the membrane while others help transport substances from one side of the membrane to the other.
Insert here: Practising Template W/S Cell Q2 W/S PM Qs 1,2,3,4,5