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11 Cards in this Set
- Front
- Back
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How does the rate of oxygen absorption from the alveoli change the rate of alveolar ventilation?
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Increasing the rate of absorption of oxygen causes a higher rate of ventilation to achieve the same partial pressure of oxygen in the alveoli.
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How does the rate of carbon dioxide absorption to the alveoli change the rate of alveolar ventilation?
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An increased rate of CO2 absorption causes an increased rate of alveolar ventilation to achieve the same rate of partial pressure in the alveoli.
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What are the pressures of oxygen and carbon dioxide in the alveoli? In dead space? In venous blood?
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In dead space, oxygen is around 150mmHg and CO2 is around 1 mmHg.
In alveoli, oxygen is around 105 mmHg and CO2 is around 40 mmHg. In blood, oxygen is 40 mmHg and CO2 is 46 mmHg. |
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What causes the systemic arterial blood to have slightly less oxygen pressure than the pulmonary capillaries?
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Pulmonary capillaries are mixed with shunted blood that has not been oxygenated, thus lowering the oxygen content sent out to the arterial system.
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What is the partial pressure of oxygen in the interstitial fluid? In the cells?
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Interstitial fluid- 40 mmHg
Cells- 23 mmHg |
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How does oxygen consumption affect tissue oxygen concentration and blood flow?
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With increased oxygen consumption, less blood flow is needed to maintain the same oxygen concentration.
With decreased oxygen consumption, more blood flow is needed to maintain the same oxygen concentration. |
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What is the partial pressure of carbon dioxide in the interstitial fluid? In the cells?
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Interstitial fluid- 45 mmHg
Cells- 26 mmHg |
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How is oxygen transported in the blood?
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2-5% is dissolved in the blood.
95-98% is combined with hemoglobin. |
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What is the oxygen capacity? What is the Hb oxygen saturation?
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Capacity= maximum amount of oxygen that the blood can carry.
Saturation= % of hemoglobin that is saturated with oxygen. |
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What can shift the oxygen-hemoglobin curve to the left? To the right?
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Left shift- decreased temp, PCO2, 2-3 DPG, increased pH.
Right shift- increased temp, PCO2, 2-3 DPG, decreased pH. |
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How do anemia and CO poisoning affect the oxygen-hemoglobin curve?
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Anemia and CO poisoning shift the curve down.
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