by Tyler Brooker
The lungs are massive vessel-like organs in the chest cavity. They are the largest and most essential part of the respiration system. The air we breathe enters and exits our lungs through two passages; the bronchioles and the bronchi. Lungs' main responsibility is to take oxygen from the atmosphere and transport it into the blood stream. It then excretes carbon dioxide from blood into the atmosphere. This gas exchange happens through specialized cells that form many millions of thin-walled air sacs. Some non-respiratory functions are also performed by the lungs.