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8 Cards in this Set
- Front
- Back
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ohm's law for fluids |
deltaP=QR; deltaP is driving force, Q is flow, and R is resistance; fluids flow in response to differences in pressure; they encounter friction when they flow |
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what happens to pressures in the vasculature |
decline as we move down the length of the vessel; this results in a pressure drop between the ends of the tube and the energy represented by that pressure difference is lost as heat; the relationship between pressure and flow is the hydrodynamic equivalent of Ohm's law with resistance to flow as the constant of proportionality |
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conductance= |
1/resistance |
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so Q can also equal |
(deltaP)C |
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the units of resistance are always |
a ration of pressure units and flow units |
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in hemodynamics the units ofr pressure are often |
mmHg and flow is ml.s makeing the resulting units of resistance mmHg s/ml and this is often abbreviated as a peripheral resistance unit (PRU) |
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typical total peripheral resistance= |
1 PRU |
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velocity of flow= |
Q/A; flow (Q) is the same throughout the tube; velocity of flow (v) varies with cross sectional area |
