CELL (PLASMA) MEMBRANE

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CELL (PLASMA) MEMBRANE

• Chapter 4
• Pg. 77-78

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Homeostasis

• Balanced internal conditions of cells
• Maintained by cell membrane controlling what
  enters or leaves cell.

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Cell (Plasma) Membrane

• Function
• Protective barrier
• Semi-permeable Regulated transport of molecules
  in and out of cell

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Cell (Plasma) Membrane

• Function
• Protective barrier
• Semi-permeable Regulated transport of molecules
  in and out of cell
• Allow cell recognition
• Interact with the environment

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Structure

1. Phospholipid Bilayer - Two layers of
   phospholipids

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Structure

• Phospholipid Bilayer - Two layers of
  phospholipids
• Phospholipid contains
• 2 fatty acid chains that are nonpolar
  (hydrophobic)
• Polar head (hydrophilic)

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Structure

• Phospholipid Bilayer - Two layers of
  phospholipids
• Phospholipid contains
• 2 fatty acid chains that are nonpolar
  (hydrophobic)
• Polar head (hydrophilic)
• Fatty acid tails create a hydrophobic center

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Membrane Structure

• 2. Membrane Proteins-embedded in the lipid layer
• a. Integral Proteins extend through both sides
  of membrane

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Membrane Structure

• 2. Membrane Proteins-embedded in the lipid layer
• a. Integral Proteins extend through both sides
  of membrane
• Receptor Proteins binds to substances outside
  the cell

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Membrane Structure

• 2. Membrane Proteins-embedded in the lipid layer
• a. Integral Proteins extend through both sides
  of membrane
• Receptor Proteins binds to substances outside
  the cell
• Transport (channel) Proteins Aids in moving
  substances across membrane
• Glycoproteins (with Carbs) cell identification

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Membrane Structure

• 2. Membrane Proteins-embedded in the lipid layer
• b. Peripheral Proteins only on one side of
  membrane
• -Enzymes (assist in chemical reactions)

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Membrane Structure

• 3. Cholesterol in bilayer for strength

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• Blue Biology Textbook
• Draw Figure 4-10 Pg. 77
• Draw Figure 4-11 Pg. 78
• Cell membrane coloring