Question

Where does oxygen exit from the blood?

Answer 1

Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled. Oxygenated blood travels from the lungs through the pulmonary veins and into the left side of the heart, which pumps the blood to the rest of the body (see Biology of the Heart : Function of the Heart).

Answer 2

in organisms the oxigen form oxihaemoglobin by reacting with hemoglobin for its supplythen it breaks into oxigen and hemoglobin again.