Red Blood Cells (RBCs or erythrocytes)

Red Blood Cells (RBCs or erythrocytes): discoid cells that have lost their nuclei and have become specialised sacs carrying haemoglobin. Haemoglobin (hemoglobin) binds oxygen and carbon dioxide and ferries them around the circulation. Red blood cells can distort themselves to squeeze through very narrow capillaries (where gas exchange occurs). Dramatic illustration on a white background.