What is the primary function of red blood cells?

The primary function of red blood cells is to transport oxygen throughout the body. They achieve this through a protein called hemoglobin, which binds to oxygen in the lungs and carries it to tissues and organs where it is needed. This oxygen transport is critical for cellular respiration, allowing cells to produce the energy necessary for various bodily functions. The efficient delivery of oxygen is vital to maintaining overall health and supporting metabolic activities, emphasizing why this function is considered the main role of red blood cells.