Cell Membrane

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Cell Membrane
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homeostasis.
homeostasis
Maintaining stable internal environment
Think . STAY at HOME temperature
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homeostasis.

• One way that a cell maintains homeostasis is by
  controlling the movement of substances across the
  cell membrane..

Semi-permeable
GATE KEEPER
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Cell Membrane

• provides structural support to the cytoplasm
• recognizes foreign material
• communicates with other cells

Contributes to homeostasis

• made of phospholipids.
• The phosphate head is polar
• and is hydrophilic.
• The fatty acid tails are
• nonpolar and hydrophobic

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Cell Membrane
hydrophilic

• Lipid Bilayer

hydrophobic
hydrophilic
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Fluid Mosaic Model

• 'fluid' b/c the membrane is not solid, but more
  like a 'fluid'.
• 'mosaic' because like a mosaic that is made up of
  many different parts.

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Parts to membrane

• Proteins
• Cholesterol
• Carbohydrates

Signal/transport
Prevents fatty acid tails from sticking to ea
other
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• Carbohydrates
• Act as cell-surface markers for identification.
• Identify chemical signals released by other
  cells.