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Cell Membrane Plasma Membrane Cell Membrane • 2 layers (bilayer) of phospholipids • Similar to a mayonnaise sandwich – 2 pieces of bread with may stuck together • Each individual phosphoplipid has a – head that is hydrophilic – tail that is hydrophobic The phospholipid STOP!! BIG WORDS!!!! • Hydrophobic: Hydro = Water ; Phobic = afraid – The tail of the phospholipid is hydrophobic • Hydrophilic: Hydro = Water ; Philic = loving – The head of the phospholipid is hydrophilic • Millions of these molecules line up together to form a cell membrane! What is the cell membrane for? Head • Controls material going into the cell • Controls material going out of the cell • Holds the cell together • Able to “talk” with other cells and molecules Phospholipid Tail Cell Membrane Cell Membrane • Membrane looks big? Picture this……. • It would take 10,000 membranes to equal the thickness of one sheet of paper!!! Cell Membrane Cell Membrane Proteins • Proteins are stuck throughout the cell membrane • They act as tunnels letting large molecules into and out of the cell Receptor Molecules • Molecules that that help the cell “talk” with other cells or molecules • Must fit together like a puzzle piece Keep in mind…... • Not all substances can pass through the cell membrane!!! Only certain substances when needed…….this is called SELECTIVE PERMEABILITY…. • Know what this means……