What is the primary function of red blood cells?

• A. Transporting hormones
• B. Clotting blood
• C. Transporting oxygen to tissues
• D. Fighting infections

Answer: (C)

The primary function of red blood cells, also known as erythrocytes, is to transport oxygen from the lungs to the tissues throughout the body. They contain a protein called hemoglobin, which binds to oxygen molecules in the lungs and carries them through the bloodstream. This oxygen delivery is essential for cellular respiration, a process that generates the energy necessary for cells to function properly.

In addition to transporting oxygen, red blood cells also play a role in carrying a small amount of carbon dioxide back from the tissues to the lungs for exhalation. However, their primary and most critical function remains the transport of oxygen, making them vital for maintaining proper physiological processes and overall health.