A person's lungs are not the same size. The right lung is a little wider than the left lung, but it is also shorter. According to York University, the right lung is shorter because it has to make room for the liver, which is right beneath it. The left lung is narrower because it must make room for the heart.
The right lung is divided into three different sections, called lobes. The left lung has just two lobes. The lobes are made of sponge-like tissue that is surrounded by a membrane called pleura, which separates the lungs from the chest wall. Each lung half has its own pleura sack. This is why, when one lung is punctured, the other can go on working.
The lungs are like bellows. When they expand, they pull air into the body. When they compress, they expel carbon dioxide, a waste gas that bodies produce. Lungs do not have muscles to pump air in and out, though. The diaphragm and rib cage essentially pump the lungs.
One of the best ways to promote good lung health is to avoid cigarette smoke because at least 70 out of the 7,000 chemicals in cigarette smoke damages the cells within the lungs. According to the Mayo Clinic, people who smoke have the greatest risk of lung cancer.
The Rush University Medical Center also suggests practicing deep breathing exercises, staying hydrated and regular exercise to keep the lungs healthy.