Which circulating cells contain hemoglobin molecules?

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Multiple Choice

Which circulating cells contain hemoglobin molecules?

Explanation:
Hemoglobin is the oxygen-carrying protein inside red blood cells, so circulating cells that contain hemoglobin are erythrocytes. These cells are specialized for gas transport, loading oxygen in the lungs and delivering it to tissues, while also carrying some carbon dioxide away. The other circulating cells listed—lymphocytes, monocytes, and leukocytes—are white blood cells focused on immune functions and do not contain significant amounts of hemoglobin for transport.

Hemoglobin is the oxygen-carrying protein inside red blood cells, so circulating cells that contain hemoglobin are erythrocytes. These cells are specialized for gas transport, loading oxygen in the lungs and delivering it to tissues, while also carrying some carbon dioxide away. The other circulating cells listed—lymphocytes, monocytes, and leukocytes—are white blood cells focused on immune functions and do not contain significant amounts of hemoglobin for transport.

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