cell1-membranetransport

cell1-membranetransport - Organization of animals plants...

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Scale of nature (log) Objectives Cell 1: membranes. At the end of this session, you will be able to: P Describe transport processes across the plasma membrane : ion channels, GLUT, important physiological ion pumps P Describe how and why cells regulate pH and volume.
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Cellular membranes ( fluid mosaic) Membrane proteins
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Transport across membranes Simple Simple diffusion P Occurs through the lipid bilayer so small uncharged molecules or lipid soluble molecules are transported in this way. . P Rate is inversely proportional to size. P Rate is directly proportional to lipid solubility of molecule (partition coefficient).
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Facilitated diffusion Ions (Na + , K + , Ca 2+ , Cl - ) through ion channels P Occurs on membrane proteins which transport molecules selectively , along gradients. Glucose, fructose, amino acids by mediated transport ‘Uniport’ http://www.stolaf.edu/people/giannini/biological%20anamations.html P P Glucose entry into cells Sugars transported Tissues found in GLUT1 Glucose, other hexoses Most GLUT2 Glucose, other hexoses Liver, kidney, intestine GLUT3 Glucose, other hexoses Neurons GLUT4 Glucose (insulin regulated)
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cell1-membranetransport - Organization of animals plants...

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