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The Cell Membrane

The Cell Membrane. Pages 60-61. The Cell Membrane. Vocabulary. Phospholipid = lipid made of a phosphate group and two fatty acids. Vocabulary. Polar = Hydrophilic, or "water-loving” Soluble in water Nonpolar = Hydrophobic, or “water-fearing” NOT soluble in water. Vocabulary.

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The Cell Membrane

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  1. The Cell Membrane Pages 60-61

  2. The Cell Membrane

  3. Vocabulary • Phospholipid = lipid made of a phosphate group and two fatty acids

  4. Vocabulary • Polar = Hydrophilic, or "water-loving” • Soluble in water • Nonpolar = Hydrophobic, or “water-fearing” • NOT soluble in water

  5. Vocabulary • Lipid bilayer = the basic structure of a membrane, composed of two layers of phospholipids

  6. Passive Transport • Passive transport = movement across the cell membrane that DOES NOT require energy • Examples = Diffusion and Osmosis

  7. Passive Transport - Diffusion • Diffusion = the movement of a substance from an area of HIGH concentration to LOW concentration. • Note: the symbol for concentration is [ ].

  8. Passive Transport - Diffusion • Equilibrium = [ ] of a substance is EQUAL throughout a space

  9. Passive Transport - Osmosis • Osmosis = the diffusion of water across a semi-permeable membrane

  10. Passive Transport - Osmosis • 3 possibilities for direction of H2O movement: • Hypertonic solution = water moves OUT • High [solute] in solution • Hypotonic solution = water moves IN • Low [solute] in solution • Isotonic solution = NO NET WATER MOVEMENT • Equal [solute] as [H2O]

  11. Passive Transport - Osmosis

  12. Observing Osmosis – Data Table

  13. Key: = water; = solute

  14. Key: = water; = solute

  15. Key: = water; = solute

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