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9 give the response BEFORE any compensation occurs.

9.  How would ESV be affected if arterial blood pressure increased?  Why?



10.  A.  What happens to blood flow if blood viscosity decreases?
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9.  How would ESV be affected if arterial blood pressure increased?  Why?

ESV stands for end-systolic volume or the volume of blood left in the heart after a systole (contraction). An increase in arterial blood pressure means that it will be harder to push more blood past the arteries. When it's harder to push more blood out of the heart to/in the arteries then this means there will be more blood left in the ventricle after contractions since not all of it was able to go out into the arteries (due to incresed pressure). More blood left in the ventricle after a contraction means means that ESV is increasing with more pressure in the arteries.
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10.  A.  What happens to blood flow if blood viscosity decreases?

The relationship between BP and viscosity is such that, given a constant systolic BP, if blood viscosity increases, then the total peripheral resistance (TPR) will necessarily increase, thereby reducing blood flow.  Conversely, when viscosity decreases, blood flow and perfusion will increase.  Because of the dependence of systemic arterial BP on cardiac output and TPR, if blood viscosity and TPR rise, systolic BP must then increase for cardiac output to be maintained.  Consequently, blood viscosity has been established as a major determinant of the work of the heart and tissue perfusion.  Since increased viscosity requires a higher BP to ensure the same circulating volume of blood, both the burden on the heart and the forces acting on the vessel wall are directly modulated by changes in blood viscosity.
Source http://meridianvalleylab.com/the-relationship-between-blood-pressure-and-blood-viscosity
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