What is the main function of red blood cells?

The primary function of red blood cells is to transport oxygen and carbon dioxide. These cells are packed with hemoglobin, a protein that binds oxygen in the lungs and carries it to the body's tissues. Once the oxygen is delivered, hemoglobin picks up carbon dioxide, a waste product produced by cellular metabolism, and transports it back to the lungs, where it can be exhaled. This dual role in gas exchange is crucial for maintaining the body’s metabolic processes and ensuring that all cells receive sufficient oxygen to function effectively. The effectiveness of red blood cells in this role underlies their critical importance in the circulatory system and overall homeostasis.