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Chapter 5: Homeostasis
and Transport
Section 5-1: Passive Transport
Passive Transport
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Homeostasis
Plasma membrane’s role
Role of energy
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Kinetic energy
Entropy
Brownian motion
Chapter 5
Section 1 Passive Transport
Diffusion
Diffusion
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Diffusion
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Equilibrium
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Concentration gradient
Example: Sugar water
Motion is constant
Diffusion across a membrane
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Factors
Molecule Passing Through Plasma Membrane
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Osmosis – A function of water potential
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Osmosis Continued
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Direction of osmosis
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Tonicity and water pressure
Hypotonic solution
Hypertonic solution
Isotonic solution
Hypotonic
Solution
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Hypertonic
Solution
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Isotonic
Solution
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Responses of Cells to Tonicity
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Contractile vacuoles
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Plant/Animal cells in hypotonic solution
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Paramecium
Turgor pressure
Cytolysis
Plant/Animal cells in hypertonic solution
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Plasmolysis
Shrivel
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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Chapter 5
Section 1 Passive Transport
Hypertonic, Hypotonic,
Isotonic Solutions
Q.O.D.: Molecules Passing Through Cell.
What kind of transport is shown?
Explain how you know.
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Facilitated diffusion
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When:
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Size
Polar
Role of proteins
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Channel proteins
Carrier proteins
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Specificity
Chapter 5
Section 1 Passive Transport
Facilitated Diffusion
Ion Channels
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Ion channels in membrane
Why?
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Polarity
Protein channels
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Open
Gated
Chapter 5
Section 1 Passive Transport
Ion Channels
Chapter 5: Homeostasis
and Transport
Section 5-2: Active Transport
Cell Membrane Pumps
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Role of Energy
Direction
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Concentration gradient
Carrier proteins – Cell membrane pumps
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Sodium-Potassium Pump
Na+ and K+ ions
Electrical gradient
Chapter 5
Section 2 Active Transport
Sodium-Potassium
Pump
Sodium-Potassium Pump
Endocytosis and Exocytosis
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Endocytosis
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Role of cell membrane
Vesicles
Types:
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Pinocytosis
Phagocytosis
Receptor-mediated
Exocytosis
Chapter 5
Section 2 Active Transport
Endocytosis
and
Exocytosis
Endocytosis and Exocytosis
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