BIOL 2202 Lecture Notes - Lecture 2: Electrochemical Gradient, Resting Potential, Atp Hydrolysis
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27 Jun 2017
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Chapter 12: transport across cell membranes: overview, transmembrane transport, membrane potential, nerve cell signalling, overview. Movement of a molecule down its concentration gradient. Rate of diffusion across a lipid bilayer depends on: Small, nonpolar molecule move the fastest (oxygen, n2, steroids, hormones) small, uncharged polar molecules (water, ethanol) larger, uncharged, polar (glucose, amino acids) ions. Molecules that cant diffuse across the membrane must be transported. Polar substances (charged or organic molecules) must use specific membrane transport proteins. The transporter is the one which will have one end open and one end closed and the channel has both ends open. Remember water molecules are small, polar (uncharged) molecules they can diffuse through. Isotonic solution water potential is equal between sides (water potential is where. Hypotonic solution water potential is higher outside. Movement of water across a membrane water wants to move. The higher water potential means it wants to move)
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