Diffusionlab_part1_Spr09

Diffusionlab_part1_Spr09 - Announcements Please turn OFF...

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1 Announcements • Please turn OFF your cell phones • Please hold on to your Prelab questions until after the quiz – Make sure your section # OR ULI’s name is on the prelab • Bring goggles to lab this week – even if you wear glasses Diffusion and Osmosis Diffusion (and osmosis) • Is the tendency for molecules of any substance to spread out evenly into the available space. Figure 7.11 A, Campbell, 2005 Molecules of dye Membrane (cross section) Net diffusion Net diffusion Equilibrium • Substances diffuse down their concentration gradient. Figure 7.11 B from Campbel , 2005 Net diffusion Net diffusion Net diffusion Net diffusion Equilibrium Equilibrium Why study diffusion in a biology course? Interactions between cells and the extracellular environment. • The extracellularvs. the intracellular environment. • Getting into and out of the cell. – Diffusion and osmosis. Diffusion and Life • All living things have certain requirements they must satisfy in order to remain alive. – exchanging gases (usually CO
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Diffusionlab_part1_Spr09 - Announcements Please turn OFF...

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