Physiology 206 Lecture 3 Outline of Last Lecture I Cell Physiology II Fluid in body III Diffusion IV Facilitated Diffusion V Active Transport Outline of Current Lecture Osmosis Van t Hoff Osmolarity Nervous System Classify Neurons Current Lecture Osmosis diffusion of water o Water diffuses from an area of high concentration to an area of low concentration o Change the concentration of water by adding solutes o 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 membrane o Liquid molecules exert same pressure in gas phase o 1 mole liter 22 4ATM o 1 ATM 760 mmHg o 22 4 ATM 15 000 mmHg o 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 o o The added concentration of the molarities of everything the solutes in the plasma Can be obtained by measuring osmotic pressure The difference in osmolarity never lasts long due to osmotic pressure restores the balance Nervous system o 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 to o Neurons bring information from one place to another o Glial cells maintain the environment that allows neurons to operate Classify neurons o By structure and function o Neurons have dendrites a soma cell body axon and axon terminals Signal goes from dendrites or soma to axon terminals o Structure Multipolar many dendrites and one axon Bipolar two dendrites Monopolar one dendrite
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