The left and right lung both have the same function. They bring oxygen into the body during inhalation and expire carbon dioxide to remove it from the body. Oxygen provides the body with energy, while carbon dioxide is a metabolic waste product and is removed from the body.
The lungs are respiratory organs that are found in the majority of air breathing animals. They are also found in a few species of fish and snails. Lungs are the principal way in which air breathing organisms transport oxygen from the atmosphere into their blood stream. Small cells known as alveoli comprise the right and left lung. These cells are the sites for gas exchange in the lungs and help the organism keep blood gas levels steady.