What is the primary function of red blood cells?

The primary function of red blood cells is to carry oxygen throughout the body. These cells, also known as erythrocytes, contain hemoglobin, a protein that binds to oxygen in the lungs and releases it to tissues and organs where it is needed for cellular respiration and energy production. The ability to transport oxygen efficiently is crucial for sustaining life, as oxygen is essential for the metabolic processes of cells.

While other components of blood have their specific roles—such as white blood cells that fight infections, platelets that help coagulate blood, and plasma proteins that assist in waste removal—red blood cells are specifically adapted for oxygen transport. This unique function is vital for maintaining the functions of every organ and tissue in the body and highlights the importance of red blood cells in the circulatory system.