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Passive Transport

Cellular Structure and Function. Chapter 7. 7.4 Cellular Transport. Passive Transport. Movement of particles across the cell membrane without using energy. Three Modes of Passive Transport. Diffusion. Facilitated Diffusion. Osmosis. Cellular Structure and Function. Chapter 7. Diffusion.

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Passive Transport

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  1. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Passive Transport • Movement of particles across the cell membrane without using energy Three Modes of Passive Transport • Diffusion • Facilitated Diffusion • Osmosis

  2. Cellular Structure and Function Chapter 7 Diffusion 7.4 Cellular Transport • Movement of particles from an area of high concentration to an area of lower concentration Initial Conditions Diffusion Low High High Low

  3. Cellular Structure and Function Chapter 7 7.4 Cellular Transport • Diffusion is controlled by • Temperature • Pressure • Concentration Dynamic Equilibrium • Reached when diffusion of material into the cell equals diffusion of material out of the cell • Molecules continue to move, but the overall concentration remains the same.

  4. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Diffusion in a Cell

  5. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Facilitated Diffusion • Movement of materials across the plasma membrane using channel proteins

  6. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Channel Proteins

  7. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Osmosis • Diffusion of water across a selectively permeable membrane Three Types of Solutions • Isotonic • Hypotonic • Hypertonic

  8. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Isotonic Solution • Water and dissolved substances diffuse into and out of the cell at the same rate. Blood Cell Plant Cell 11,397x

  9. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Hypotonic Solution • Solute concentration is higher inside the cell. • Water diffuses into the cell. Plant Cell Blood Cell 13,000x

  10. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Hypertonic Solution • Solute concentration is higher outside the cell. • Water diffuses out of the cell. Blood Cell Plant Cell 13,000x

  11. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Active Transport • Movement of particles • across the cell membrane using energy Active Transport Using Carrier Proteins

  12. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Types of Active Transport Pumps • Na+/K+ ATPase pump • Moves three Na+ ions out of the cell and two K+ ions into the cell Carrier Proteins

  13. Cellular Structure and Function Chapter 7 7.4 Cellular Transport Endocytosis • Process by which the cell surrounds and takes particles into the cell Exocytosis • Secretion of material out of the plasma membrane

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