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Movement of Material Through the Cell Membrane

Movement of Material Through the Cell Membrane. Chapter 7-3. Cell Membrane. Composed of a lipid bilayer and embedded protein carriers Most biological membranes are selectively permeable. Passive Transport movement of materials across the cell membrane without using energy.

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Movement of Material Through the Cell Membrane

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  1. Movement of Material Through the Cell Membrane Chapter 7-3

  2. Cell Membrane • Composed of a lipid bilayer and embedded protein carriers • Most biological membranes are selectivelypermeable

  3. Passive Transportmovement of materials across the cell membrane without using energy • Passive transport allows molecules to move across a membrane from areas ofhighconcentration to areas oflowconcentration.

  4. Example of Passive Transport • Adding food coloring to water demonstrates passive transport

  5. Example of Passive Transport 1. Diffusion • Molecules of a substance move from areas of high concentration to areas of low concentration until equilibrium is met.

  6. Facilitated Diffusion • Some molecules move from areas of high concentration to low concentration with the help of a carrier protein. • It does not require energy!

  7. a)passive b) facilitated

  8. aquaporin Example of Facilitated Diffusion • Osmosis The movement of water from areas of high concentration to areas of low concentration. - Osmotic pressure moves water across a membrane from a more dilute solution into a more concentrated solution

  9. AQUAPORIN

  10. Osmotic Solutions • Isotonic – Water concentration outside = water concentration inside the cell. -the egg’s mass will not increase or decrease H2O H2O H2O H2O H2O H2O

  11. Osmotic solutions cont. • Hypotonic – water concentration outside the cell is higher than inside the cell. • In which direction will the water move? H2O H2O H2O H2O H2O H2O H2O H2O H2O H2O

  12. Osmotic solutions cont. • Hypertonic – water concentration outside the cell is lower than inside the cell. • In which direction will the water move? H2O H2O H2O H2O H2O H2O H2O H2O

  13. Active Transport • Uses energy (ATP) to move a molecule against a gradient from areas of low concentration to areas of high concentration. • Calcium, potassium and sodium ions are moved via active transport with the help of molecularpumps. YouTube - Active Transport

  14. Examples of Active Transport • 1. Endocytosis - A process of cellular ingestion by which the cell membrane folds inward to bring substances into the cell. • Large molecules such as proteins are taken in through endocytosis. YouTube - Endocytosis

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