Final answer:
Treating carbon monoxide poisoning with 100 percent oxygen is effective because it displaces carbon monoxide from hemoglobin, allowing for normal oxygen transport, whereas giving carbon dioxide would not help.
Step-by-step explanation:
The administration of 100 percent oxygen is crucial in treating carbon monoxide poisoning because it helps to displace the carbon monoxide from the hemoglobin in the blood. Carbon monoxide binds to hemoglobin with a much higher affinity than oxygen, which prevents oxygen from being transported to the tissues where it is needed.
By providing 100% oxygen, it creates a steep gradient that favors the displacement of carbon monoxide, allowing normal oxygen transport to resume. In contrast, giving carbon dioxide would not be effective, as it would not aid in the displacement of carbon monoxide from hemoglobin and does not help in oxygenating body tissues.