Breathing carbon monoxide can decrease VO₂ max by A)binding to hemoglobin to displace oxygen. B)by reducing pulmonary ventilation. C)decreasing the number of red blood cells. D)decreasing the arterial PO₂ to half its normal value.

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Carbon monoxide binds to hemoglobin in the blood, reducing the amount of oxygen that can be transported to the body's tissues. This decreases the maximum amount of oxygen that can be used during exercise, also known as VO2max.

Breathing Carbon Monoxide Can Decrease VO2 Max by

Breathing Carbon Monoxide Can Decrease VO₂ Max by