Lab 3_Cell Physiology_student

Lab 3_Cell Physiology_student - Ch 3. Cell physiology LAB 3...

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Ch 3. Cell physiology
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LAB 3 – Cell Physiology Eukaryotic cellular membranes are fluid mosaics of lipids and proteins Membrane structure results in selective permeability Transport: Passive (simple diffusion, facilitated diffusion, osmosis) Active (ATP-driven , e.g. Na + -K + pump) Bulk (endo- and exocytosis) Phospholipid bilayer Hydrophilic region of protein Hydrophobic region of protein Hydrophilic region of protein
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Passive Transport Through the Cell Membrane DIFUSSION : movement of molecules from an area of high concentration to an area of low concentration (eg. Simple diffusion of oxygen across lipid bilayer) Rate of diffusion across the membrane depends on size and polarity of molecules. Facilitated diffusion : diffusion with the help of a transport protein (a. channel proteins and b. carrier proteins OSMOSIS: diffusion of water (small, polar molecule) across a selectively permeable membrane Aquaporins : water channel proteins
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Tonicity Tonicity : a measure of osmotic pressure
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This note was uploaded on 02/28/2012 for the course BIO 220 taught by Professor Morre during the Spring '09 term at USC.

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Lab 3_Cell Physiology_student - Ch 3. Cell physiology LAB 3...

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