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Physiology - Test II - Blood Gases
Questions related to blood gases.
9
Physiology
Graduate
03/14/2011

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Term
The presence of hemoglobin in the normal arterial blood increases its oxygen concentration approximately by how many times? Assume that hemoglobin content is 15g/dl.
Definition
1.34 x 15 x .974 = 19.5 vol % + 0.3 = 19.8%

Approx 20/0.3 - 70 times
Term
If a patient has a HB level of 14g/100ml blood and a PaO2 of 55mmHg (85% saturated with oxygen) approximately how much oxygen is present in every 100ml of arterial blood?
Definition
o2 content - 1.34 x 14 x 0.85 - 15.9 vol %

Plus .15 - 16%
Term
What is the PO2 for arterial blood by definition?
Definition
100 mmHg
Term
What is hemoglobin's purpose?
Definition
to act as a buffer for oxygen
Term
If you went to the Rocky Mountains and your arterial blood has a partial pressure of 60 mmHg, what would be your percent saturation of Hb and volume percent of oxygen? Is this a significant change?
Definition
% sat Hb = 89%
vol % O2 = 18%
No; the buffer quality of hemoglobin keeps vol % O2 from dropping significantly
Term
You are breathing pure O2 and the PO2 of your arterial circulation is 600 mmHg. What is the % sat of your Hb, assuming that normal Hb is 97% saturated? Is this a significant change
Definition
21 vol %

No; normal blood is 19.8 vol % 02
Term
What is P50?

What is its normal value?
Definition
The partial pressure of oxygen when Hb is 50% saturated.

Normal P50 = PaO2 = about 26 mmHg
Term
What is P50?

What is its normal value?
Definition
The partial pressure of oxygen when Hb is 50% saturated.

Normal P50 = PaO2 = about 26 mmHg
Term
When P50 increases, to which direction does the HbO2 curve shift?

What happens when P50 decreases?
Definition
to the right

to the left
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