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12 Cards in this Set
- Front
- Back
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ANS – cholinergics (by way of the parasympathetics) is going to cause ... of the pulmonary vasculature. Adrenergic (by the sympathetics) is going to cause primarily .... If it’s the beta receptors that are stimulated, you’ll get ..., but there are more alpha receptors in the lungs so ... will predominate.
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vasodilation
vasoconstriction vasodilation vasoconstriction |
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Baro and chemoreceptors:
if the pressure w/in the pulmonary vasculature is increased, baroreceptors will sense that and ... will occur in a reflex manner. If CO2 levels increase and O2 levels go down, chemo receptors will sense that and to protect against shunting, ... will occur. Regulation by baro and chemoreceptors is fairly minimal. |
vasodilation
vasoconstriction |
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The primary means pulmonary vasculature is regulated is by ..., which induces ....
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hypoxia
vasoconstriction |
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... V/Q is associated w/ wasted ventilation
... V/Q is associated w/ shunting. |
High
Low |
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In the lungs, there is a net positive outward movement of fluid from the pulmonary capillaries, resulting in ...
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filtration
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What are the 2 factors that mainly affect hydrostatic pressure in the interstitium?
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air pressure and surface tension
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If you have an individual w/ shock lung/respiratory distress syndrome. Associated with it is decreased production of surfactant. Surface tension will ..., hydrostatic pressure in the interstitium will .... You take away from the absorption portion of the equation. You will have more .... Many ppl with RDS will also have pulmonary edema.
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increase
decrease filtration |
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Ventilation and perfusion is best at the ...
the ... of the lung has the lowest V/Q ratio (shunted blood) and the ... has the highest (wasted ventilation). The best match of ventilation and perfusion is somewhere in the .... |
base
base apex middle |
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Normal blood levels:
O2 = ... mmHg CO2 = ... mmHg |
100
40 |
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look at slides 15-16
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ok
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Which one plays the bigger role, the shunting (low V/Q ratio) or the wasted ventilation (high V/Q ratio)?
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shunting
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In the normal lung, everything is close to 1.
Average V/Q ratio is about ..., but for all practical purposes, we’ll say it is .... |
0.8
1 |
