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This 3 page One Day of Notes was uploaded by Zoe Lipner on Tuesday October 21, 2014. The One Day of Notes belongs to 1005 at George Washington University taught by Scully in Fall2014. Since its upload, it has received 71 views. For similar materials see Biology of Nutrition & Health in Biosystem Engineering at George Washington University.
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Date Created: 10/21/14
Transport 102114 520 PM Plasma Membrane Gate amp Gatekeeper All cells have a plasma membrane Separates the cell from its environment Serves as a selectively permeable barrier 0 Importance need substances in different amounts in different areas Biological important molecules transported across the membrane The Plasma Membrane Fluid mosaic model 0 Mobility of components of the membrane Components 0 Bilayer of phospholipids 0 Cholesterol 0 Proteins o Glycolipids amp glycoproteins Outline of transport Diffusion 0 Movement from area of higher concentration to lower Substance has to dissolvedisperse within the solvent 0 Rate of diffusion Heat Concentrations o What can diffuse across the membrane Small stuff Any small lipid Any small gas Vvater Choestero based hormones ie testosterone Osmosis 0 Proper water balance is vital for every cell Passive diffusion of water From an area of lower solute concentration An isotonic solution has an equal concentration of solute on either side Passive vs A hypotonic solution lower solute concentration A hypertonic solution higher solute concentration Hypo 9 hyper equilibrium balanced solutes Walled cells such as those of plants are protected from busting in a hypotonic solution because the cell wall restricts continual water uptake active transport o Concentration gradients Areas of abundance to scarcity o Passive transport Downhill in energy Movement from high concentration to low o Active transport u Passive transport 0 O Facilitated Most hydrophilic substances cannot cross the plasma membrane wo help Facilitated diffusion using 2 types of membrane transport proteins Channel proteins Carrier proteins Passive carrier Passive carrier proteins assist in the diffusion An important passive carrier of glucose is a protein called GLUT which helps maintain blood glucose levels through facilitated diffusion Active transport o Facilitated always o Active carrier proteins transport Specific molecules across the plasma membrane based on the shape of the molecule Use energy in the process Moves substances from low concentration to high The breakdown of ATP provides energy for the proton pump an active carrier protein that moves protons H against a concentration gradient Membrane involved transport 0 Exocytosis Get large things out excreted via transport vesicles 0 Endocytosis Pinocytosis 2 Cell drinking drinks any substances mainly water from the outside Phagocytosis 2 Defense system reaches out and grabs a bad microbe and kills it 2 Pseudopodium Fake arms Receptor mediated endocytosis Why can39t we drink salt water Bc it is a hypertonic solution to our cells causing water to rush out of our cells
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