1. Chapter 5: Homeostasis and Transport
Section 5-1: Passive Transport

2. Passive Transport Homeostasis Plasma membrane’s role Role of energy
Kinetic energy
Entropy
Brownian motion

3. Section 1 Passive Transport
Chapter 5
Diffusion

4. Diffusion Diffusion Equilibrium Diffusion across a membrane
Concentration gradient
Example: Sugar water
Equilibrium
Motion is constant
Diffusion across a membrane
Factors

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Molecule Passing Through Plasma Membrane
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Osmosis – A function of water potential
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7. Osmosis Continued Direction of osmosis Tonicity and water pressure
Hypotonic solution
Hypertonic solution
Isotonic solution

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Hypotonic
Solution
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Hypertonic
Solution
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Isotonic Solution
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11. Responses of Cells to Tonicity
Contractile vacuoles
Paramecium
Plant/Animal cells in hypotonic solution
Turgor pressure
Cytolysis
Plant/Animal cells in hypertonic solution
Plasmolysis
Shrivel

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Plant
Cell in
Isotonic
Solution
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Plant
Cell in
Hypotonic
Solution
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Cell in Hypertonic
Solution
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15. Hypertonic, Hypotonic, Isotonic Solutions
Section 1 Passive Transport
Chapter 5
Hypertonic, Hypotonic, Isotonic Solutions

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Q.O.D.: Molecules Passing Through Cell.
What kind of transport is shown?
Explain how you know.
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17. Facilitated diffusion
When:
Size
Polar
Role of proteins
Channel proteins
Carrier proteins
Specificity

18. Facilitated Diffusion
Section 1 Passive Transport
Chapter 5
Facilitated Diffusion

19. Ion Channels Ion channels in membrane Why? Protein channels Polarity
Open
Gated

20. Section 1 Passive Transport
Chapter 5
Ion Channels

21. Chapter 5: Homeostasis and Transport
Section 5-2: Active Transport

22. Cell Membrane Pumps Role of Energy Direction
Concentration gradient
Carrier proteins – Cell membrane pumps
Sodium-Potassium Pump
Na+ and K+ ions
Electrical gradient

23. Sodium-Potassium Pump
Section 2 Active Transport
Chapter 5
Sodium-Potassium Pump

24. Sodium-Potassium Pump

25. Endocytosis and Exocytosis
Role of cell membrane
Vesicles
Types:
Pinocytosis
Phagocytosis
Receptor-mediated
Exocytosis

26. Endocytosis and Exocytosis
Section 2 Active Transport
Chapter 5
Endocytosis and Exocytosis

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Endocytosis and Exocytosis
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