Plasma Membrane Notes

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Plasma Membrane Notes
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CHARACTERISTICS

• Maintains homeostasis (balance with environment)
• Selective permeability allows some molecules
  into the cell while keeping others out.

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Example of selective permeability screen door
keeps something out (bugs, pets, small children)
and allows something through (small things)
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STRUCTURE
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• Phospholipids
• Lipids (fatty acid) with a phosphate group
  attached.
• Polar head and non-polar tails
• Hydrophilic (likes water) head and hydrophobic
  (afraid of water) tail

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Tail
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Hydrophilic and Hydrophobic
Hydrophilic likes water Hydrophobic fears
water - repels water
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Carrier Proteins

• Found in plasma membrane (also known as transport
  proteins)
• Allows larger substances to move through the
  plasma membrane.

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Cholesterol molecule

• Helps stabilize the phospholipids
• Prevents the fatty acid chains of the
  phospholipids from sticking together

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