CH 5 - Section 5.3-5.5 Saturday 2:19 PM Simple Diffusion...

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Section 5.3-5.5 Saturday, December 01, 2007 2:19 PM Simple Diffusion - Small molecules pass through phospholipid bilayer, molecule that is hydrophobic, soluble in lipids, enters membrane readily and able to pass through it. Electrically charged or polar molecules like amino acids, sugars, and ions don’t pass through. Facilitated Diffusion - passive movement through a membrane involving a specific carrier protein; does not proceed against a concentration gradient. Rate of Diffusion Effects Diameter - Smaller diffuse faster Temperature - High Temp = Faster Diffusion, b/c they are moving faster Electric charge Concentration Gradient - greater concentration gradient = more rapid diffusion Osmosis - water is small enough to move through membranes through osmosis, completely passive uses no metabolic energy, concentration gradient influences how water diffuses. Hypertonic - higher solute concentration than other solution its compared to Isotonic - Equal solute concentrations Hypotonic - lower solute concentration that other solution its compared to
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CH 5 - Section 5.3-5.5 Saturday 2:19 PM Simple Diffusion...

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