Physiology 206 Lecture 3 Outline of Last Lecture I. Cell PhysiologyII. Fluid in bodyIII. DiffusionIV. Facilitated DiffusionV. Active TransportOutline of Current Lecture - Osmosis- Van’t Hoff- Osmolarity- Nervous System- Classify NeuronsCurrent Lecture- Osmosis: diffusion of watero Water diffuses from an area of high concentration to an area of low concentrationo Change the concentration of water by adding soluteso Hydrostatic pressure: the force that opposes diffusion- Van’t Hoff-discovered that sucrose molecules exert same pressure as any other molecule that can’t cross a membraneo Liquid molecules exert same pressure in gas phaseo 1 mole/liter=22.4ATMo 1 ATM=760 mmHgo 22.4 ATM=15,000 mmHgo 0.31=the concentration of the sum of our blood plasma=310 mOsm- Osmolarity (Osm)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o The added concentration (of the molarities) of everything (the solutes) in the plasmao Can be obtained by measuring osmotic pressureo The difference in osmolarity never lasts long due to osmotic pressure (restores the balance)- Nervous systemo Can send smaller messages (to individual or small groups of cells)o Endocrine messages circulate in the bloodstream Gradual decay (stay in system longer)o Neural messages have target cells they deliver messages too Neurons-bring information from one place to anothero Glial cells-maintain the environment that allows neurons to operate- Classify neuronso By structure and functiono Neurons have dendrites, a soma (cell body), axon and axon terminals Signal goes from dendrites or soma to axon terminalso Structure: Multipolar-many dendrites and one axon Bipolar-two dendrites Monopolar-one
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