What is the blood cell containing hemoglobin?

The blood cell containing hemoglobin is called a red blood cell or erythrocyte. Hemoglobin is a protein that is composed of four polypeptide chains, each of which is associated with an iron atom. Hemoglobin transports oxygen from the lungs to the rest of the body and transports carbon dioxide from the body to the lungs. Red blood cells are produced in the bone marrow and have an average lifespan of about 120 days.