A PO2 of 40mmHg in venous blood would normally: W) result in almost fully deoxygenated haemoglobin.X) be found in blood in the pulmonary arteries.Y) indicate that tissues have "extracted" no oxygen.Z) be found in systemic venous blood.Question 18Select one:a.if only W, X and Y are correct.b.if only W and Y are correct.c.if only X and Z are correct.d.if only Z is correct.e.if all are correct
Question
A PO2 of 40mmHg in venous blood would normally: W) result in almost fully deoxygenated haemoglobin.X) be found in blood in the pulmonary arteries.Y) indicate that tissues have "extracted" no oxygen.Z) be found in systemic venous blood.Question 18Select one:a.if only W, X and Y are correct.b.if only W and Y are correct.c.if only X and Z are correct.d.if only Z is correct.e.if all are correct
Solution
To answer the question step by step:
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Understanding PO2 of 40mmHg in venous blood:
- PO2 (partial pressure of oxygen) of 40mmHg is typical for venous blood returning to the lungs after oxygen has been delivered to tissues.
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Analyzing each option:
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W) Result in almost fully deoxygenated haemoglobin:
- This is incorrect. At a PO2 of 40mmHg, hemoglobin is not fully deoxygenated. It is typically about 75% saturated with oxygen.
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X) Be found in blood in the pulmonary arteries:
- This is correct. Pulmonary arteries carry deoxygenated blood from the right side of the heart to the lungs, and a PO2 of 40mmHg is typical for this blood.
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Y) Indicate that tissues have "extracted" no oxygen:
- This is incorrect. A PO2 of 40mmHg indicates that tissues have extracted some oxygen from the blood.
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Z) Be found in systemic venous blood:
- This is correct. Systemic venous blood, which returns to the heart from the body, typically has a PO2 of around 40mmHg.
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Selecting the correct answer:
- Based on the analysis, only X and Z are correct.
Therefore, the correct answer is: c. if only X and Z are correct.
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