When a person starts exercising, many body parameters change from the original state of rest. The trend an two such parameters are shown in the graph during the initial phase of exercise. High Q Low Time since start of exercise P and Q most likely represent: A. P: carbon dioxide level in vein B. P: breathing rate C. P: oxygen level in artery D. P: oxygen level in artery Q: oxygen level in artery. Q: carbon dioxide level in artery. Q: carbon dioxide level in vein. Q: oxygen level in vein.

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A:

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