Final answer:
The majority of oxygen in blood is carried in red blood cells (RBCs) with hemoglobin. Some is dissolved in plasma.
Step-by-step explanation:
The majority of oxygen in blood is carried in red blood cells (RBCs) with hemoglobin. Some oxygen is also dissolved in the plasma. Only a small amount of oxygen-1.5 percent-is dissolved directly into the blood itself, while most of the oxygen-98.5 percent-is bound to hemoglobin and carried to the tissues.