Lab 4 - Human Cardiovascular

Only 13 of the stroke volume is ejected in systole

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Unformatted text preview: the remaining remaining 2/3 causes the vessels to distend Result = Increase in Arterial Pressure End of Ventricular Contraction – Arterial walls recoil passively and blood continues to leave the arteries during diastole diastole Result = Arterial Volume & Arterial Pressure Decrease Changes in capacitance dominate over changes Changes in capacitance dominate over changes in in resistance Arterial Pressure Systolic Pressure (SP) – maximum arterial pressure reached during peak ventricular ejection Diastolic Pressure (DP) – minimum arterial pressure occurring during ventricular filling occurring during ventricular filling Pulse Pressure (PP) – difference between systolic and diastolic pressure PP = SP – DP Can also be approximated using the formula: PP = SV/arterial compliance (Ca) SV/arterial Venous Pressure Determined by changes in venous volume and venous compliance. li Venous Pressure is < 10mmHg 60-70% of your blood resides within your veins bl Since the volume in the veins is so large, small changes in venous capacitance result in large shifts in volume in venous capacitance result in large shifts in volume. Increase sympathetic nerve activity, decrease diameter of veins, which decreases capacitance increase v...
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