Movement of oxygen during respiration

Answer 1

Hemoglobin or "red blood cells" are composed of 4 iron(Fe) molecules. When oxygen(O2) is enhaled, these iron molecules bond with the oxygen molecules; which are then transported to the tissues in your body. Once the cells reach the tissues the bonds between the iron and the oxygen are broken and the oxygen is deposited. The iron then bonds with carbon dioxide (CO2) and is brought back to the lungs where it is exhaled. This process repeats itself until the blood cell dies in about 9 days when another is generated.

Answer 2

During respiration, oxygen is inhaled through the respiratory system into the lungs, where it diffuses across the alveoli into the bloodstream. The oxygen is then transported by red blood cells bound to hemoglobin to the body's cells and tissues, where it is used in cellular respiration to produce energy. The waste product carbon dioxide is produced and transported back to the lungs to be exhaled.