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Cell (Plasma)Membrane




All cells acquire the molecules and ions they need from
their surrounding extracellular fluid. There is constant
 “traffic” of substances moving across the membrane.
Moving Substances Across the
             Cell Membrane




The cell membrane functions as a semi-permeable or selectively-
permeable barrier. This means it allows very few molecules across it
while keeping the majority of organically produced chemicals inside
the cell.
Types of Transport
Diffusion
Molecule Movement of Diffusion
Simple Diffusion
Facilitated Diffusion




http://w3.dwm.ks.edu.tw/bio/activelearner/05/images/ch05c3.gif
Membrane Proteins
Channel Proteins




http://mywebpages.comcast.net/epollak/PSY255_pix/ion_channels.JP
Ion Channels




http://homepage.psy.utexas.edu/homepage/class/Psy332/Salinas/Electrophysiology/channels.gif
K+ Ion Channels
Facilitated Diffusion of Glucose
Osmosis




http://www.biologycorner.com/resources/osmosis.jpg
Isotonic Solution




http://www.biologycorner.com/resources/isotonic.gif
Hypotonic Solution




http://www.uic.edu/classes/bios/bios100/summer2003/hypot.jpg
Hypertonic Solution




http://www.uic.edu/classes/bios/bios100/summer2003/hypert.jpg
Red Blood Cells in Hypotonic
               Solution




http://www.biosci.ohiou.edu/introbioslab/Bios170/170_3/09009jwa.jpg
Red Blood Cells in Hypertonic
               Solution




www.biosci.ohiou.edu/.../ 170_3/09014jwa.jpg
Movement of Water
Red Blood Cells in Solution
Plant Cells in Solution




Turgid Elodea        Plasmolyzed Elodea
Active Transport

• Movement of molecules across the cell
  membrane that requires energy.
• Source of energy: ATP
Sodium/Potassium Pump
Endocytosis and Exocytosis
Exocytosis
Exocytosis




http://www.accessexcellence.org/RC/VL/GG/images/Fig_14.25.jpg
Endocytosis




http://www.uccs.edu/~rmelamed/MicroFall2002/Chapter%2010/Endocyto
Receptor-Mediated Endocytosis




http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120068/bio02.swf::Endocytosis%20and
%20Exocytosis
Cell Signaling




http://www.scq.ubc.ca/conversing-at-the-cellular-level-an-introduction-to-signal-transduction/

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Cell transport 2011a

Editor's Notes

  1. Hemolysis: release of hemoglobin into fluid after lysing of RBCs Crenation: formation of abnormal indentation into cell membrane