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

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

Section 1 Passive Transport Chapter 5 Diffusion

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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Osmosis Continued Direction of osmosis Tonicity and water pressure Hypotonic solution Hypertonic solution 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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Hypertonic, Hypotonic, Isotonic Solutions Section 1 Passive Transport Chapter 5 Hypertonic, Hypotonic, Isotonic Solutions

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Facilitated diffusion When: Size Polar Role of proteins Channel proteins Carrier proteins Specificity

Facilitated Diffusion Section 1 Passive Transport Chapter 5 Facilitated Diffusion

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

Section 1 Passive Transport Chapter 5 Ion Channels

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

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

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

Sodium-Potassium Pump

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

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

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