Discussion
In the formula VO2 = S.V.× H.R. × a - v̄ O2 diff.
a - v̄ O2 diff. stands for ...................
Answer: B
It stands for the arterial-mixed venous oxygen difference.
This is the Fick equation:
\[ \begin{aligned} \dot{V}O_{2} &= SV \times HR \\ &\quad \times (a - \bar{v})O_{2}\ \text{diff} \end{aligned} \]
Stroke volume times heart rate is cardiac output, and the a-v̄ O2 difference is the difference in oxygen content between arterial blood and mixed venous blood, the blood returning from all the tissues, which is what the bar over the v denotes. It measures how much oxygen the tissues extract.
Options A, C and D drop the 'mixed venous' part, which is what the symbol v̄ specifies, or give terms that do not describe a difference between arterial and venous oxygen content.
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