Chapter 5 - l Hypertonic = net water flow out of cell The...

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Chapter 5 Cell Transport and Cell Permeability 1
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l The ease with which substances can cross the cell membrane ¡ Nothing passes through an impermeable barrier ¡ Anything can pass through a freely permeable barrier ¡ Cell membranes are selectively permeable Permeability 2
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Cell Transport l Passive ¡ The cell does not spend energy l Active ¡ When the cell spends energy 3
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l Simple Diffusion ¡ Movement of a substance from an area of high concentration to a low concentration ¡ Continues until concentration gradient is eliminated Passive Transport - Diffusion 4
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Simple Diffusion 5
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6
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l Osmosis ¡ Diffusion of water across a semipermeable membrane from an area of high water concentration to an area of lower water concentration Passive Transport - Diffusion 7
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Osmosis 8
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l The effects of osmotic solutions on cells l Isotonic = no net gain or loss of water l Hypotonic = net gain of water into cell ¡ The cell will suffer hemolysis (burst)
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Unformatted text preview: l Hypertonic = net water flow out of cell The cell will suffer crenation (shrink) Osmosis -Tonicity 9 Osmosis 10 Facilitated diffusion l Substances to be transported bind to a carrier protein l Down concentration gradient l Also through membrane channels Passive Transport - Diffusion 11 Facilitated Diffusion 12 l Active Transport Consumes ATP Independent of concentration gradients Ion pumps Active Processes 13 The Sodium Potassium Exchange Pump 14 l Vesicular Transport Material moves into or out of cells in membranous vesicles Endocytosis is movement into the cell l Receptor mediated endocytosis (coated vesicles) l Pinocytosis l Phagocytosis (phagosome) Exocytosis movement out of the cell Active Processes 15 Vesicular Transport 16 Vesicular Transport 17...
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Chapter 5 - l Hypertonic = net water flow out of cell The...

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