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13 Cards in this Set
- Front
- Back
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continuity equation for blod flow
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The flow through a vessel is dependent on the velocity of blood in the vessel and the crossectional area of the vessel
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is blood flow turbulent or laminar ?
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Laminar
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Where does blood flow the fastest in a vessel
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in the middle
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what 2 things determine flow?
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1) resistance
2)pressure difference |
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what is the main reason for increased blood flow in a muscle while working?
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decreased vascular resistance
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what determines resistance in a blood vessel
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1)length
2) blood viscosity- # of RBC in the blood |
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how does a smokers RBC count compare to that of a non smoker?
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Smokers have more
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what is a a typical hematic rate?
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40-45%
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what happens to vascular resistance if you double the radius of the blood vessel?
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it drops TO 1/16 of the value
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why are most people hypertensive?
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they have a high vascular resistance b/c they have narrowed vessels.
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where is resistance physiologically regulated?
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the systemic arterioles
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what 4 things will increase blood flow in a vessel?
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1. The pressure difference along a vessel is increased
2. When the radius of a vessel is increased 3. When the length of a vessel is decreased 4. When the viscosity of the blood is decreased |
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what determines mean blood pressure
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Cardiac output x Total Periferal resistance
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