Eukaryotic Cell Membrane

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Eukaryotic Cell Membrane
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Cell Membrane

• Cell membrane the flexible boundary of a cell
  (also called a plasma membrane)
• It separates a cell from its surroundings.
• It allows nutrients to enter and waste to be
  removed.

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Cell Membrane

• Homeostasis maintaining a healthy balance
• The cell membrane allows some molecules into the
  cell and keeps others out.

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Cell Membrane

• Selective permeability allowing only certain
  molecules to enter and leave the cell
• Selective permeability is like a screen on a
  window

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Cell Membrane

• What gets in?
• H2O freely enters cell
• O2 in ,CO2 out
• Na and Ca at certain times in certain amounts
• Waste leaves but cant reenter

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Membrane Structure

• Phospholipid lipid with a glycerol backbone and
  two fatty acid chains, and a phosphate group

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Membrane Structure

• The polar head is hydrophilic it likes water
• Fatty acid tail is hydrophobic it does not like
  water.
• They form a bilayer

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Membrane Structure
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Membrane Structure

• The cell membrane also contains proteins to help
  support the cell structure.
• Cholesterol to keep the fatty acid tails from
  sticking together

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Membrane Structure

• Fluid Mosaic Model the organization of the cell
  membrane.
• Fluid because it is not fixed in a particular
  spot
• Mosaic because of the patterns the proteins make

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Membrane Structure

• Proteins in the membrane function as
• Transport proteins moving molecules across the
  membrane
• Identify chemical signals