Which of the following statements is accurate regarding the functions of human blood components?

Red blood cells are primarily responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide back to the lungs for exhalation. White blood cells play a crucial role in the immune system by fighting off infections and foreign bodies. Platelets, on the other hand, are essential for blood clotting, not for fighting infections. Lastly, while the majority of oxygen transport occurs via hemoglobin in the red blood cells, a small amount of oxygen does indeed dissolve directly into the plasma, aiding in minor transport.