Passive Processes - Two Basic Types of Cells Passive...

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Two Basic Types of Cells Passive Processes (cont.) * facilitated diffusion- when substances are allowed to cross the cell membrane with the help of integral proteins Movement of Water Across the Cell Membrane * Water crosses cell membranes by two routes: * by diffusion through the lipid bilayer * and through water channels called aquaporins . Osmosis * The special case of the diffusion concerning the movement of water across a selectively permeable membrane * Osmotic Pressure- The force created by the tendency of water to move * measured by the amount of pressure that stops osmosis Measuring Osmotic Concentratioan * Osmole- one mole of dissolved particles * Osmolality- the number of osmoles of solute per kilogram of water * Osmolarity- the number of osmoles of solute per liter of solution * Ex: 1 M NaCl = 2 osm/L 1 M CaCl 2 = 3 osm/L Effects of Blood Cell in Various Tonicity of Solutions Filtration * The movement of solvents and dissolved substances across a selectively permeable membrane by gravity or mechanical pressure (low pressure to high pressure)
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Passive Processes - Two Basic Types of Cells Passive...

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