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Unformatted text preview: tch. Resistance is proportional to the vessel length (L) and
the fluid viscosity
the fluid viscosity () and inversely proportional to the
and inversely proportional to the
fourth power of the radius (r). Small changes in radius will have a large affect on blood flow Blood flow is regulated primarily through changes in
the radius of the vessels. Problem There is a 10 ml volume increase in two vessels. One is
stiff with a small capacitance and the second is a very
compliant, large capacitance vessel. How will this
volume change effect pressure in these two vessels?
th Answer – There will be a greater increase in pressure in the
vessel with the smaller compliance compliance
compliance = volume/pressure
A high compliance – easy to stretch – means that a
large volume can be added with only a small
change in pressure. Capacitance (holding capacity) is often used
Capacitance (holding capacity) is often used
together with compliance. If a vessel is
compliant, then it has large capacitance.
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This document was uploaded on 01/13/2014.
- Winter '14