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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
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?• 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
Head
Tail
Cell Membrane• Membrane looks big? Picture this…….
• It would take 10,000 membranes to equal the thickness of one sheet of paper!!!
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