PHIS 206 1st Edition Lecture 14 Outline of Last Lecture I Action Potentials II Fluids III Anatomy IV Circulation V Physical Properties Outline of Current Lecture I Osmotic Pressure II Regulating Pressure III Pulmonary Circulation IV Renal Function Curve Current Lecture I Osmotic Pressure colloid osmotic pressure pressure exerted by proteins in cardiovascular system stretch receptors pressure down in colloids so receptors go to the brain which releases autonomic output arterials become constricted and there is a big increase in pressure short term regulation neuromechanism that depends on stretch receptors only used for quick responses stretch less parasympathetic output stretch more sympathetic output stretch barrel receptors pressure goes down when you get up quickly and feel lightheaded II Regulating Pressure How about long term regulation Body Fluid Mechanism Long Term Regulation of Pressure 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 1 Cardiac Output 2 Arterial Pressure 3 Renal Loss of Salt Water 6 Venus Return 5 Plasma Volume A indicates the same direction as the previous step A indicates a reverse in direction 4 ECF Volume If cardiac output goes up then arterial pressure goes up rate of losing fluid goes up ECF goes down plasma volume goes down Venus Return goes down and cardiac output goes down Renal artery curve S shaped curve Arterial pressure x axis v Relative Urine Output y axis o Greater than 100 mm Hg pressure goes down lose fluid madly Veins allow blood to go UP only Muscle pumps skeletal muscle bring blood back DOWN III Pulmonary Circulation Flow Pressure Resistance No great long vessels b w lungs and the heart so resistance is less flow is less pressure is less Difference pressures of pulmonary lungs is 1 3 of systemic circuit Effects part of the lung above the heart sees less pressure and less flow than the lower part of lungs If arterial pressure is up then bigger lungs IV Renal Function Curve set point blood pressure automatically returns 100 mm Hg hypertension chronic elevated blood pressure Essential hypertension type that 90 of people with hypertension have Increases deposition of plaque in arteries and arterioles o diameter is reducing upstream pressure is increasing self aggravating pos feedback if hurt pressure pushing on capillaries hypertensive people heal slowly o less kidney mass since they heal slowly instead of renal function curve up by 5 fold on y axis will be less than that for hypertensive people o nasty in brain if hypertensive people get hurt piece of brain lost b c capillaries do not heal increases incidents of STROKE NO EXTERNAL SIGNS FOR HYPERTENSION
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