Hemoglobin in red blood cells can bind both oxygen and carbon dioxide, but not at the same time since it uses the same binding site.

Name: Hemoglobin in red blood cells can bind both oxygen and carbon dioxide, but not at the same time since it uses the same binding site.
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Hemoglobin can bind both oxygen and carbon dioxide, but they bind at different sites. Oxygen binds to the iron in the heme group, while carbon dioxide binds to the amino groups of the protein chains.

Hemoglobin in Red Blood Cells Can Bind Both Oxygen and Carbon