BIOG 1440 Lecture 3: Notes
1 Feb 2017
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Bring your answers to section typed on a separate piece of paper. Correct answer is d. hydrophobic is just fine for being put in a memrane. Keep in mind charge and size: h 2 o, o 2, h + (not very well, glucose (biggish, na + (not very well) Objectives: tonicity, types of transport, active transport & the alternating access model, transport can lead to formation membrane potential. Need a mechanism to get some things across. Diffusion: (like oxygen) will get across the membrane just because of diffusion ion. Water diffuses, but needs help to diffuse rapidly. Osmosis = movement of a solvent (water) across a selectively permeable membrane into a region of higher solute concentration . Tonicity = ability of surrounding solution to cause a cell to gain/lose water. Isotonic = solute concentration is the same on both sides of the membrane. Hypertonic = solute concentration is higher outside the cell (water wants to go out)
