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11 Cards in this Set
- Front
- Back
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how is aortic pressure maintained during diastole
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high elasticity
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compare the pressure plots of aorta vs. femoral artery.
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aorta has higher MAP, but femoral artery has higher peak pressure. femoral artery is muscular artery, as it has less elastic tissue than the aorta
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Pulse Pressure is determined by:
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SV, compliance
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how do arterial compliance and pulse pressure change with age? how does this affect cardiac work?
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compliance helps to decrease peak systolic pressure. compliance decreases with age, thus cardiac work increases with age as W=PV.
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laminar vs turbulent flow
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laminar flow - middle is fastest, it is quiet
turbulent - no uniform velocity distribution, loud. |
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factors leading to turbulent flow:
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LOW VISCOSITY
HIGH VELOCITY high diameter (w/out losing velocity) high density |
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hematocrit as related to turbulent flow?
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low hematocrit = low viscosity, thus more likely to have turbulent flow.
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problems associated with turbulent flow:
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-requires high pressure gradient to move the blood
-turbulent flow increases likelihood of clotting |
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vessel diameter as related to viscosity and turbulent flow?
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viscosity is normally constant in relation to BV diameter. however, as BV diameter < 0.3mm, viscosity decreases, and this can lead to turbulent flow.
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law of LaPlace?
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T=Pr
tension = pressure * radius |
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how do capillaries resist bursting, given their thin walls?
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capillaries have very small radii - thus, according to T=Pr, they have very low tension.
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