Physiology 206 Lecture 13 Outline of Last Lecture I Blood flow through heart II Diastole III Systole IV Frank Starling s Law V Heart Contraction Outline of Current Lecture I mmHg II Ohm s Law III Poiseville s Law IV Regulation of cardiac output Current Lecture 2 14 14 Veins 10mmHg Venules 10 15mmHg Capillaries 15 40mmHg Arterioles 40 100mmHg Arteries 100mmHg Ohm s Law o Current voltage resistance Flow pressure resistance Autoregulation of flow keeps oxygen constant even when metabolic rate changes Poiseville s Law o Resistance length radius 4 o If you double the radius flow increases 16 fold o If you the radius the flow is 1 16 the previous amount Regulation of cardiac output o Sympathetic increases heart increases force increases cardiac output o Parasympathetic inhibits SA node slows down heart 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 With strong stimulation it can stop the heart Resistance vessels arterioles o Can alter resistance by altering diameter Circulation brings oxygen and removes waste Capillary walls are porous walls o Cells are too big to pass o Water and solutes pass easily Smaller than proteins glucose vitamins etc Colloid osmotic pressure o Changes in pressure from proteins Distensibility of cells amount of change in volume per unit change of pressure o Veins have 5x distensibility of arteries Compliance total change in volume per unit change of pressure o Veins compliance storage vessels
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