Chapter 5: Homeostasis and Transport

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Chapter 5 Homeostasis and Transport

• Section 5-1 Passive Transport

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Passive Transport

• Homeostasis
• Plasma membranes role
• Role of energy
• Kinetic energy
• Entropy
• Brownian motion

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Diffusion
Section 1 Passive Transport
Chapter 5
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Diffusion

• Diffusion
• 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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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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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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Section 1 Passive Transport
Chapter 5
Hypertonic, Hypotonic, Isotonic Solutions
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Molecules Passing Through Cell
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Facilitated diffusion

• When
• Size
• Polar
• Role of proteins
• Channel proteins
• Carrier proteins
• Specificity

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Facilitated Diffusion
Section 1 Passive Transport
Chapter 5
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Ion Channels

• Ion channels in membrane
• Why?
• Polarity
• Protein channels
• Open
• Gated

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Ion Channels
Section 1 Passive Transport
Chapter 5
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Chapter 5 Homeostasis and Transport

• Section 5-2 Active Transport

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Cell Membrane Pumps

• Role of Energy
• Direction
• Concentration gradient
• Carrier proteins Cell membrane pumps
• Sodium-Potassium Pump
• Na and K ions
• Electrical gradient

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Sodium-Potassium Pump
Section 2 Active Transport
Chapter 5
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Sodium-Potassium Pump
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Endocytosis and Exocytosis

• Endocytosis
• Role of cell membrane
• Vesicles
• Types
• Pinocytosis
• Phagocytosis
• Receptor-mediated
• Exocytosis

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