Final answer:
Erythrocytes, also known as red blood cells, are the main carriers of oxygen in the blood stream due to the presence of hemoglobin.
Explanation:
Erythrocytes (Red Blood Cells) are the primary cells responsible for carrying oxygen in the bloodstream. They contain large amounts of hemoglobin, a protein that binds with oxygen. This process forms oxyhemoglobin, which transports oxygen to tissues throughout the body.
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