Each red blood cell contains about 250 million hemoglobin molecules and so can carry at least one billion molecules of oxygen.

Name: Each red blood cell contains about 250 million hemoglobin molecules and so can carry at least one billion molecules of oxygen.
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Each hemoglobin molecule can bind up to four oxygen molecules, so with about 250 million hemoglobin molecules per red blood cell, it can indeed carry at least one billion molecules of oxygen.

Each Red Blood Cell Contains About 250 Million Hemoglobin Molecules