KEY CONCEPT The cell membrane is a barrierKEY CONCEPT The cell membrane is a barrier
that separates a cell from the extern...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
• The cell m...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
• The cell m...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
• The cell m...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
cell membrane
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers...
cell membrane
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers...
cell membrane
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
• The cell m...
Cell membranes are composed of twoCell membranes are composed of two
phospholipid layers.phospholipid layers.
• The cell m...
KEY CONCEPT Materials move across membranes
because of concentration differences.
3.4 Diffusion and Osmosis3.4 Diffusion a...
Passive transport does not require energy input from a
cell.
• Molecules can move across the cell membrane
through passive...
Diffusion and osmosis are types of passive
transport.
• Molecules diffuse down a
concentration gradient.
• How would you d...
Diffusion and osmosis are types of passive
transport.
• Osmosis is the diffusion of water molecules across a
semipermeable...
Diffusion and osmosis are types of passive transport.
• There are three types of solutions.
• isotonic
3.4 Diffusion and O...
Some molecules can only diffuse through transport
proteins.
• Some molecules cannot easily diffuse across the cell
membran...
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Membrane & Diffusion notes

  1. 1. KEY CONCEPT The cell membrane is a barrierKEY CONCEPT The cell membrane is a barrier that separates a cell from the externalthat separates a cell from the external environment.environment.
  2. 2. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers.
  3. 3. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane has two major functions.The cell membrane has two major functions. cell membrane
  4. 4. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane has two major functions.The cell membrane has two major functions. o forms a boundary between inside and outside of the cell cell membrane outside cell inside cell
  5. 5. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane has two major functions.The cell membrane has two major functions. – forms a boundary between inside and outside of the cell – controls passage of materials cell membrane outside cell inside cell
  6. 6. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers.
  7. 7. cell membrane Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane is made of a phospholipidThe cell membrane is made of a phospholipid bilayer.bilayer.
  8. 8. cell membrane Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane is made of a phospholipid bilayer.The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membraneThere are other molecules embedded in the membrane.. protein cholesterol proteincarbohydrate chain protein channel
  9. 9. cell membrane Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane is made of a phospholipid bilayer.The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane.There are other molecules embedded in the membrane. • TheThe fluid mosaic modelfluid mosaic model describes the membrane.describes the membrane. protein cholesterol proteincarbohydrate chain protein channel
  10. 10. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane is selectively permeable.The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.
  11. 11. Cell membranes are composed of twoCell membranes are composed of two phospholipid layers.phospholipid layers. • The cell membrane is selectively permeable.The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.
  12. 12. KEY CONCEPT Materials move across membranes because of concentration differences. 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis Concentration Gradient: when there is a difference in concentration between two areas
  13. 13. Passive transport does not require energy input from a cell. • Molecules can move across the cell membrane through passive transport. • There are two types of passive transport. • osmosis • diffusion 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis
  14. 14. Diffusion and osmosis are types of passive transport. • Molecules diffuse down a concentration gradient. • How would you define DIFFUSION?! 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis
  15. 15. Diffusion and osmosis are types of passive transport. • Osmosis is the diffusion of water molecules across a semipermeable membrane. 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis
  16. 16. Diffusion and osmosis are types of passive transport. • There are three types of solutions. • isotonic 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis • hypotonic • hypertonic
  17. 17. Some molecules can only diffuse through transport proteins. • Some molecules cannot easily diffuse across the cell membrane. • Facilitated diffusion is diffusion through transport proteins. 3.4 Diffusion and Osmosis3.4 Diffusion and Osmosis

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