A nurse is reviewing the physiological factors that affect a patient's cardiovascular health and tissue oxygenation. What is the systemic arteriovenous oxygen difference?
A) The average amount of oxygen removed by each organ in the body
B) The amount of oxygen removed from the blood by the heart
C) The amount of oxygen returning to the lungs via the pulmonary artery
D) The amount of oxygen in aortic blood minus the amount of oxygen in the vena caval blood
Ans: D
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The average amount of oxygen removed collectively by all of the body tissues is about 25%. This means that the blood in the vena cava contains about 25% less oxygen than aortic blood. This is known as the systemic arteriovenous oxygen difference. The other answers do not apply.
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