Cell Bio class #9 notes - Cell Bio class#9 notes Passive...

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Cell Bio class #9 notes Passive Transport: - diffuse down their concentration gradient - no work needs to be done to move substances down the concentration gradient - diffusion is a form of passive transport (requires no energy) - molecules of water in osmosis and diffusion… Osmosis: - the diffusion of water across a selectively permeable membrane - will diffuse from region of lower solute concentration to a region of higher solute concentration - if you’ve got a high conc of solute means the conc of solute is low - this is why water goes from high to low - which means area low solute to high solute - osmosis diagram: because high concentration zone, there isn’t as much water present (right)… dilute on left, so the water diffuses down concentration gradient to the right hand side - at equilibrium, the concentration of free water is the same - water flows to high concentrations of solute to even it out - U-tube experiment: use different concentrations on either side of the membrane in the u-shaped tube, you will see the water level increase on the side with the higher concentration Water Balance of Cells Without Walls (animals): - tonicity: the ability tof a solution to cause a cell to gain r lose water - isotonic solution: solute concentration same as inside the cell (no net water movement across the plasma membrane) - hypertonic solution: solute concentration greater than inside the cell (the cell ends up losing water) - hypotonic solution: solute concentration is less than inside the cell (so the
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