Lab 4 - Human Cardiovascular

Arterioles are the resistance vessels capillaries do

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Unformatted text preview: meter does not change. does not change. Characteristics Characteristics of the Vasculature Venous Vessels have very thin walls and contain smooth muscle. th Very compliant with a very large capacitance in comparison to the arterial and capillary vessels comparison to the arterial and capillary vessels Diameter can change – leads to changes in compliance and capacitance. Veins have valves What for? Vasodilation – increase in radius of the vessel Arterial Pressure Result of decreased sympathetic activity or local vasodilatory vasodilatory substances e.g. metabolites metabolites Increases capacitance Function of Volume (Capacitance is relatively constant) Contraction of the ventricles during systole ejects blood into bl the arteries. If an equal amount of blood were to flow out of the If an equal amount of blood were to flow out of the arteries, arteries, then the volume of blood would be constant and arterial pressure would not change. Only 1/3 of the stroke volume is ejected in systole the Only 1/3 of the stroke volume is ejected in systole,...
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This document was uploaded on 01/13/2014.

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