Which of the following changes occurs during moderate exercise?

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[Chapter 3, IX B; Table 3.5]. During moderate exercise, sympathetic outflow to the heart and blood vessels is increased. The sympathetic effects on the heart cause increased heart rate and contractility, and the increased contractility results in increased stroke volume. Pulse pressure increases as a result of the increased stroke volume. Venous return also increases because of muscular activity; this increased venous return further contributes to increased stroke volume by the Frank-Starling mechanism. Total peripheral resistance (TPR) might be expected to increase because of sympathetic stimulation of the blood vessels. However, the buildup of local metabolites in the exercising muscle causes local vasodilation, which overrides the sympathetic vasoconstrictor effect, thus decreasing TPR. Arterial $\mathrm{PO}_{2}$ does not decrease during moderate exercise, although $\mathrm{O}_{2}$ consumption increases.

Which of the Following Changes Occurs During Moderate Exercise? A) PO2\mathrm{PO}_{2}PO2​

Which of the Following Changes Occurs During Moderate Exercise?
A) $\mathrm{PO}_{2}$