Cardiovascular System - P

Cardiovascular System - P - Physiology of the...

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    Physiology of the Cardiovascular System
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    Blood Flow through the Body Remember that the primary job of the  heart and circulatory system is to  circulate blood throughout the body Adequate blood flow supplies nutrients  and takes wastes away from all tissues  Capillaries/capillary beds are where the  actual exchange occurs
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    Pulmonary and Systemic Circuits
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    Distribution of Blood Flow at Rest Brain – 13% Muscles – 20% Kidneys – 20% Abdominal organs – 24% Approximately 6 L total blood
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    Physics of Blood Flow Blood is moved through the CV system  by pressure differences – always from  area of higher to lower pressure Rate of flow depends on the pressure  difference and resistance     F = ΔP/R
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    Physics of Blood Flow F = ΔP/R A greater pressure difference between  two points causes faster flow Higher resistance decreases flow Resistance determined by fluid viscosity,  length of the tube, and radius of the tube
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    Resistance R=(visc*length)/r 4  * a constant Viscosity affected by hematocrit level, 
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Cardiovascular System - P - Physiology of the...

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