Anatomy of the Lungs


Your lungs are a pair of organs that are part of your respiratory system. They bring oxygen into your body. And they rid your body of carbon dioxide, a waste product your cells create. Let's take a minute to learn about these organs.


Your lungs are found in your rib cage, above a muscular structure called the "diaphragm." Lungs are divided into segments called "lobes." The right lung has three lobes. The left has two. And it's slightly smaller, to make room for your heart.

Exchanging gasses

When you inhale, air enters your nose or mouth. It passes through your trachea, through two passageways called "bronchi," and into your lungs. Your lungs expand. In your lungs, the bronchi branch into smaller tubes called "bronchioles." They end in small round air sacs called "alveoli." The alveoli are covered with tiny blood vessels called "capillaries." Here is where gasses are exchanged. Oxygen is picked up by your bloodstream so it can be carried to your cells. And carbon dioxide is passed from the capillaries to your lungs. When you exhale, you breathe out this waste gas.


Strong lungs are important for good health. Avoid smoking, vaping and air pollution to keep your lungs as healthy as possible.