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12 Cards in this Set
- Front
- Back
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pressure gradient
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blood, and most fluids flow down pressure gradients, meaning that they flow from high to low pressure
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why do u lose pressure in the systemic
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the mean arterial pressure (aortic) is the highest (estimates the pressure of the LV contraction)
lose pressure as you get to the vein, and the least (The vena cava) because of friction between the blood and blood vessel walls |
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hydrostatic pressure
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not moving, the lateral component of pressure, around the height of the water column
once the fluid starts flowing (dynamic) then you start to see loss in pressure |
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isovolumetric contraction
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occurs when the left ventricle contracts on the slightly compressible blood, transfering the energy to the blood, but since the AV/semilunar are closed, blood has no where to go...
increase pressure without decreasing volume |
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driving pressure
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created by the left ventricle, allows higher pressure blood to displace lower pressure blood of the ciruclation
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flow is proportional to
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pressure gradient (the difference between the absolute P in two different areas), depends on change P not absolute P
Flow = 1/R |
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resistance
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the tendency to oppose flow, comes from friction between blood and blood vessel and cell to cell contact
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resistance equation
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Poiseulle's law
R = 8nL/r40 n = viscosity (doesn't really change) L = length of system (since in closed determined system, doesn't change) 8/pi = constant only thing that matters is r4 |
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flow rate
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volume of blood the passes a certain point per given time period (L/min)
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velocity of flow
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distance given a fluid per unit of time
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equation of veloctiy
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v = flow rate (Q) / cross sectional area (A)
which means that the velocity is FASTER in smalller area |
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equation for the mean arterial pressure
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CO X Periferal resistance (arterioles)
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