PNB 2264 Lecture Notes - Lecture 10: Homeostasis, Tonicity, Osmotic Concentration
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23 Jan 2017
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Cell membrane dynamics: cell membrane, membrane transcript - passive, membrane transcript - active, carriers vs. ion channels. Proteins allow cell to receive messages in and out of the cell. Peripheral proteins - attach to either inner or outer face of membrane. Integral proteins - protrude partly or all the way across membrane. Plasma membrane: function: physical barrier not structure, exchange, communication, attachment. Few molecules are permeable - gases, small lipid soluble compounds. Does not require energy from the cell. Materials move from a region of higher concentration to a region of lower concentration (down the concentration gradient) diffusion. Molecules are moved from lower concentration to high. Passive transport concentration (up the concentration gradient) Flux - movement that has a direction. Molecule is moving flux in one direction. The net flux of a solute s in one dimension x is described by the fick eq as the product of the concentration gradient (dcs) and the diffusion coefficient for that solute (ds)
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