What type of blood cell is primarily responsible for transporting oxygen?

The choice of red blood cells is correct because these cells, also known as erythrocytes, are specifically designed for the transportation of oxygen throughout the body. They contain a protein called hemoglobin, which binds oxygen in the lungs and carries it to tissues and organs, where it is released for use in various metabolic processes. Additionally, red blood cells also play a role in transporting carbon dioxide, a waste product of metabolism, back to the lungs for exhalation.

White blood cells serve primarily in the immune response, helping to defend the body against infections and foreign invaders. Platelets are crucial for blood clotting and preventing excessive bleeding when injuries occur, while plasma cells are a type of white blood cell that produce antibodies, aiding in the body's immune responses. Each of these cell types has distinct functions, but red blood cells are uniquely equipped for oxygen transport.