Final answer:
A small amount of carbon monoxide in the air would not alter the PO2 of inspired air or the PO2 of arterial blood.
Step-by-step explanation:
The statement presented is true. A small amount of carbon monoxide in the air would not alter the PO2 of inspired air or the PO2 of arterial blood. This is because carbon monoxide does not significantly affect the partial pressure of oxygen in the air or the blood. The diffusion of oxygen into the blood occurs based on the concentration gradient, and carbon monoxide does not disrupt this gradient.