Physiology 206 Lecture 13 Outline of Last Lecture I. Blood flow through heartII. DiastoleIII. SystoleIV. Frank Starling’s LawV. Heart ContractionOutline of Current Lecture I. mmHgII. Ohm’s LawIII. Poiseville’s LawIV. Regulation of cardiac outputCurrent Lecture2/14/14- Veins: 10mmHg- Venules: 10-15mmHg- Capillaries: 15-40mmHg- Arterioles: 40-100mmHg- Arteries: 100mmHg- Ohm’s Lawo Current = voltage/resistance- Flow = pressure/resistance- Autoregulation of flow: keeps oxygen constant even when metabolic rate changes- Poiseville’s Lawo Resistance = length/radius^4o If you double the radius, flow increases 16-foldo If you ½ the radius, the flow is 1/16 the previous amount- Regulation of cardiac outputo Sympathetic-increases heart, increases force, increases cardiac outputo Parasympathetic-inhibits SA node, slows down heartThese 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-arterioleso Can alter resistance by altering diameter- Circulation brings oxygen and removes waste- Capillary walls are porous wallso Cells are too big to passo Water and solutes pass easily Smaller than proteins (glucose, vitamins, etc.)- Colloid osmotic pressureo Changes in pressure from proteins- Distensibility of cells: amount (%) of change in volume per unit change of pressureo Veins have 5x distensibility of arteries- Compliance: total change in volume per unit change of pressureo Veins: compliance/storage
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