Which equation correctly relates DO2, VO2, and DvO2?

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Multiple Choice

Which equation correctly relates DO2, VO2, and DvO2?

Explanation:
Oxygen delivery, consumption, and the venous oxygen left after tissues extract O2 are linked by conservation of oxygen. What’s delivered per minute must either be used or remain in venous blood. So the oxygen consumed per minute equals the delivered minus what stays in the venous blood: VO2 = DO2 − DvO2. You can also rearrange to DO2 = VO2 + DvO2 or DvO2 = DO2 − VO2, but isolating VO2 in VO2 = DO2 − DvO2 shows directly how consumption relates to delivery and the venous reserve.

Oxygen delivery, consumption, and the venous oxygen left after tissues extract O2 are linked by conservation of oxygen. What’s delivered per minute must either be used or remain in venous blood. So the oxygen consumed per minute equals the delivered minus what stays in the venous blood: VO2 = DO2 − DvO2. You can also rearrange to DO2 = VO2 + DvO2 or DvO2 = DO2 − VO2, but isolating VO2 in VO2 = DO2 − DvO2 shows directly how consumption relates to delivery and the venous reserve.

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