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The Cell and Its Membrane

The Cell and Its Membrane - The Cell and Its Membrane...

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The Cell and Its Membrane The  cell  is the basic functional unit of all living things. The plasma membrane (cell  membrane) bounds the cell and encloses the nucleus (discussed presently)  and cytoplasm.  The cytoplasm consists of specialized bodies called organelles  suspended in a fluid matrix, the cytosol, which consists of water and dissolved  substances such as proteins and nutrients. The plasma membrane The  plasma membrane  separates internal metabolic events from the external  environment and controls the movement of materials into and out of the cell. The  plasma membrane is a double phospholipid membrane (lipid bilayer), with the nonpolar  hydrophobic tails pointing toward the inside of the membrane and the polar hydrophilic  heads forming the inner and outer faces of the membrane (Figure 1).
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