Your lungs are complex, yet delicate organs that replenish the oxygen in your blood with every breath you take. Each lung is divided into lobes and connected in the middle of your chest by your ...

Red blood cells carry oxygen from the lungs to every other organ, and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, ...

Smoking can cause lungs to look blackened, inflated, and inflamed, but some of the damage is reversible. Depending on the extent of the damage, it could take years for your lungs to regain a healthy, ...