Physiology 3120 Lecture Notes - Electrochemical Gradient, Resting Potential, Cell Membrane
20 Nov 2012
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Document Summary
3l plasma: membrane protein functions: receptors, enzymes, transport, cell recognition, cytoskeleton, diffusion time required for diffusion increases with the square of the distance. Luckily, most anchors cells are less than 25-50um from the capillary. Fick"s law of diffusion: kt r ph6 dc dx. Na+/k+ pump, 1 atp, 2 k+, 3 na+. Involves the use of energy to move substances against concentration gradient. and net reduction in particles inside the cell. Can be inhibited by ouabain, dinitrophenol, o2 deprivation: secondary active transport: powered by concentration gradient, usually an exchange system or co-transport. Osmotic pressure pressure needed to stop the net influx of water into a solution. Depends on the number of particles, not the type. Osmosis depends on: the permeability, the concentration gradient, and the pressure gradient. Osmole number of particles of an undissociated solute. Osmolality of body fluids is approximately 300 mosmoles per kg water.
