diffusion - Cell Membranes Osmosis and Diffusion Functions...

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Cell Membranes Osmosis 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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Blood-Brain Barrier Allows some substances into the brain, but screens out toxins and bacteria Substances allowed to cross include: water, CO 2 , Glucose, O 2 , Amino Acids, Alcohol , and antihistamines. HIV and bacterial meningitis can cross the barrier .
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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. Facilitated Diffusion 4. Active Transport
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Methods of Transport Across Membranes 1. Diffusion -passive transport - no energy expended 2.
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