diffusion1
TRANSCRIPT
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Cell MembranesOsmosis and Diffusion
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Functions of Membranes
1. Protect cell
2. Control incoming and outgoing substances
3. Maintain ion concentrations of various substances
4. Selectively permeable - allows some molecules in, others are kept out
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Phospholipid Bilayer
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Fluid Mosaic Model
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Solutions
• Solutions are made of solute and a solvent
• Solvent - the liquid into which the solute is poured and dissolved. We will use water as our solvent today.
• Solute - substance that is dissolved or put into the solvent. Salt and sucrose are solutes.
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Methods of Transport Across Membranes
1. Diffusion
2. Osmosis
3. Active Transport
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Methods of Transport Across Membranes
1. Diffusion -passive transport - no energy expended
2. Osmosis - Passive transport of water across membrane
3. Active Transport- requires energy to transportmolecules against a concentration
gradient – energy is in the form of ATP
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Diffusion• Movement of molecules from an area of high
concentration to an area of low concentration.
• Movement from one side of a membrane to another, un-facilitated
• diffusion demo
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Diffusion
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Osmosis
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Plant and Animal Cells put into various solutions
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Types of Transport