What is the Primary Function of Red Blood Cells in the Human Body?
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Red blood cells (RBCs), or erythrocytes, are haemoglobin-rich blood cells. The main function of RBCs is oxygen transportation and the removal of carbon dioxide from the body. The cells are doughnut-shaped, and lack a nucleus. The cells have a shelf life of 120 days. These cells have an essential role in supporting cellular respiration and the production of energy.
RBCs consist of a protein called haemoglobin (this imparts red colour to the cells). Haemoglobin is rich in iron that binds with oxygen. As the blood circulates throughout the body, haemoglobin releases oxygen into the tissues where it is needed for metabolic activities. RBCs collect carbon dioxide as part of waste metabolism and transport it back to the lungs. During respiration, carbon dioxide is exhaled from the body.