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13 Cards in this Set
- Front
- Back
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according to the fick equation, what 4 ways can diffusion rates increase?
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increase SA for diffusion
decrease distance (from RBC to tissue) increase time (decrease velocity) increase concentration |
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Poiseuille's equation for Resistance:
R= thus, Resistance is mostly concerned with ____? Which vessel is responsible for this? |
8*length*viscosity / (pi * radius^4)
-changes in radius -arterioles, as their radius can be adjusted |
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Cardiac Output
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Total Flow. Volume/Time, average is
5L/min |
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Cardiac Index
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Cardiac Output/Body SA
avg is 2.9L/min/m^2. |
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Conductance
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-inverse Resistance, 1/R.
i.e. Conductance = Flow/Pressure. |
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Resting Pressures: artery, venous, intracardiac
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artery: 120/80
vein: 25 -> 0 LV: 120/0 RV: 30/0. |
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TPR
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total peripheral resistance = MAP/CO. TPR is the combined resistance of all systemic BVs (inverse sums)
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Pulse Pressure
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systolic P - diastolic P.
Mean Arterial Pressure, MAP=Diastolic Pressure + 1/3 (Pulse Pressure). |
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Where is velocity the lowest? Where are the drastic increases/decreases?
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Slowest in capillaries
drastic slowing in small artery/arteriole drastic speeding in small vein (chart notes page 12) |
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write equation relating O2 consumption to blood flow and A-V diffs in [O2]
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V O2 = CO ([O2a] - [O2v])
V O2 is O2 consumption. the concentration dif from aa to vv is O2 extraction. |
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an increased demand for O2 is met by:
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increased CO or increased O2 extraction, according to the O2 consumption (V O2) equation
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two methods to measure CO
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1. Fick Principle: given O2 extraction equation, measure O2 consumption (via breaths) and extraction (via arterial and veinous blood gases)
2. Thermodilution - inject known volume and temperature of cold saline into RA, measure the temp in Pulmonary Artery at certain time intevals, convert to Volume/Time, thus CO |
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Mean Arterial Pressure =
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MAP = CO * TPR. really, CO = (MAP - CVP) / TPR. but CVP~0, so ignore it.
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