Class 02 Membranes

Class 02 Membranes - Membranes: Overcoming Barriers Class...

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Unformatted text preview: Membranes: Overcoming Barriers Class #2 Bio 208 September 4, 2008 Outline • Importance of biological membranes • Factors that control the movement of substances across membranes • Neuron Structure • Membrane potential Mechanistic – How does it work? What are the processes involved? Teleological – Why does it exist? What purpose or function does it have? What is the adaptive value of the structure or process to the survival of the organism? Function and Process A fundamental problem in all biology is the movement of material across a boundary from one compartment to another. • Movement from high to low concentration does not require energy • Movement from low to higher concentration requires energy • Whether it is soluble in water or fat • Whether it is charged or neutral • Composition and thickness of the border Homeostatsis • Extracellular fluid surrounds all cells and creates a buffer zone from external world • Body actively maintains stability of internal environment....
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This note was uploaded on 07/15/2009 for the course BIO 208 taught by Professor Lorne-mendell,s during the Fall '08 term at SUNY Stony Brook.

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Class 02 Membranes - Membranes: Overcoming Barriers Class...

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