Lecture03nth - higher osmolarity from hyposmotic solution to hyperosmotic solution"isosmotic" means same osmolarity How about movements of

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1 Diffusion across membrane • membrane must be permeable to particular chemical species • membranes are lipid bilayers with many inserted proteins Figure 3-6 (also see Fig. 5-6) Figure 5-9 Channels and carriers are membrane proteins involved in transport Figure 5-9
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2 Figure 5-4 Figure 5-9 Different kinds of carriers Figure 5-12 Facilitated diffusion - diffusion with a carrier zero net diffusion when concentrations are equal
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3 Figure 5-12 Cells have tricks for keeping facilitated diffusion going! Figure 5-13 Active transport - using ATP to move molecules AGAINST their concentration gradient Figure 5-26
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4 • molarity = number of moles/liter • osmolarity = number of moles of solute "particles"/liter 1 M NaCl Water transport across membranes: Molarity and Osmolarity Water movement Water moves from lower osmolarity to
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Unformatted text preview: higher osmolarity. from hyposmotic solution to hyperosmotic solution ("isosmotic" means same osmolarity) How about movements of ions across membranes? •opposite charges attract •charges are attracted to opposite charge in electric field 5 Which way will ions move across cell membrane? Consider these one at a time: • K + • Na + • Cl- (permeability, movement down concentration gradient, movement down electric gradient - last two combine to make electrochemical gradient) Nernst equation helps you predict which way ions will move across membrane (electrochemical) E ion = log 10 61 [ion] out z [ion] in equilibrium membrane potential (mV) that corresponds to ion concentrations on righthand side of equation (z is charge on ion, such as +1 for Na + )...
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This note was uploaded on 12/01/2010 for the course BIO SCI Bio Sci E1 taught by Professor Catherineloudin during the Spring '10 term at UC Irvine.

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Lecture03nth - higher osmolarity from hyposmotic solution to hyperosmotic solution"isosmotic" means same osmolarity How about movements of

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