Item BF092004: Carbon dioxide in the blood decreases and oxygen increases as blood passes through the lungs. (Version using graphs to show changes in carbon dioxide and oxygen)

A person measures the levels of carbon dioxide and oxygen in the blood before and after the blood passes through the lungs.  Which of the following pairs of graphs shows the changes in carbon dioxide and the changes in oxygen in the blood before and after passing through blood vessels in the lungs?

Distribution of Responses

Chart showing distrubtion of responses for Item BF092004

Percent of students responding correctly

Overall46%
Grades 6–842%
Grades 9–1252%
Male49%
Female44%
Primary Language is English47%
Primary Language is not English36%

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