Download - Cell Transport
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Movement Through A Membrane (Cell Transport)
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A few terms…
• Concentration – ratio or proportion of solute to solvent
• Diffusion – Movement of materials across the cell membrane
• Homeostasis – balance of materials necessary for life, equilibrium
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Add these!
• Solvent – Liquid water• Solute – solid (salt or sugar)
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Cell Membrane
• Fluid Mosaic Model– Phospholipid
Bilayer– Transport Proteins
• Selectively Permeable
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What Needs to go Across
• Water
• Food (Glucose)
• Raw materials (Proteins)
• Waste
• Finished proteins
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Uses No Energy
• Osmosis• Passive Transport• Facilitated Diffusion
• High conc low
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Osmosis
• Diffusion of water across the membrane
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Diffusion/Passive Transport
• Movement of other materials across the cell membrane
• Facilitated Diffusion –large molecules get help across the cell membrane– Transport Proteins are “doors”
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Passive Transport
• Equilibrium – Balance of materials on both sides of
the membrane
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Describing Solutions by their Effect on Cells
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Uses Energy
• Active Transport– Low conc high
• Endocytosis/Exocytosis
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Endocytosis
• Materials enter the cell– Cell membrane “pinches in” and forms vesicle
inside the cell
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Exocytosis
• Materials exit the cell– Membrane wrapped particles merge with the
cell membrane and are pushed into the environment
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Which one is it?
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Homeostasis
• Dynamic Equilibrium– Constant change in
order to stay in balance