Term
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Definition
| Amount of air/Unit time X tidal volume |
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Term
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Definition
| perfusion=pulminary blood flow (HR X RVSV). This is equal to cardiac output of the left ventricle in a normal situation. |
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Term
In the relationship of perfusion and ventilation:
A) Ventilation should be higher than perfusion to ensure full gas exchange.
B) Ventilation and perfusion should be similar.
C) Perfusion should be higher than ventilation to ensure adequate blood flow.
D) Ventilation and Perfusion are bad and must be stopped. |
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Definition
| B) Ventilation and perfusion should be similar. |
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Term
| How different can PvO2 be from PAO2 to not be considered pathologic? |
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Definition
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Term
| equation for partial pressure |
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Definition
Concentration % X total pressure
partial pressure=total pressure-Vapor pressure X % concentration |
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Term
| The act of contracting smooth muscle to divert blood flow to better functioning areas of the lung to prevent decreased ventilation/over ventilation. |
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Definition
| Hypoxic vasoconstriction. Keeps ventilation:perfusion ratio optimal. |
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Term
| Downside of hypoxic vasoconstriction |
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Definition
| Increased right ventricular after load. |
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Term
| equation of the respiratory quotent |
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Definition
O2 used/CO2 produced.
Healthy is about 0.8 (250ml/min / 200ml/min) |
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Term
Largest transport form of CO2
Lowest transport form of CO2
Carried transporter of CO2 |
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Definition
Bicarbonate (70%)
5-8% dissolved in plasma as carbon dioxide
25% on hemoglobin |
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Term
| The most important factor in determining the regulation of breathing by being sensed by carrotid chemoreceptors. Controls rate and depth of inspiration. |
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Definition
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Term
| How much air is inspired with each breath? How does this compare with the amount of air in the lung at any given time? |
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Definition
500ml per breath.
3L of air are present in the lung at any given time. Mixing occurs. |
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Term
| Holes in alveoli which allow air to transport between them. |
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Definition
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Term
The term that causes bronchioles to be held open, even in expiration, due to a tethering of alveoli to the sheath of the airway.
Dysfunction of this can cause what disease? |
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Definition
Radial traction.
Can cause emphysema if dysfunctional. |
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Term
| This factor much be much lower in pulmonary circulation than in systemic circulation to allow for an equal volume of blood to be transferred while pressure is much lower. |
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Definition
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Term
| Provides nutrition to lung tissue. |
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Definition
| Bronchiole arteries (part of systemic circulation) |
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