How does oxygen carried in the blood reach the other cells?

Red blood cells: Your red blood cells carry oxygen to your body. Red blood cells are packed with an iron containing protein called hemoglobin that can bind oxygen in your lungs and carry it to every cell in your body. In the tissues, oxygen leaves hemoglobin in part because of the acidic environment, called the Bohr effect, and carbon dioxide is bound by hemoglobin to carry to the lungs where you breathe it out