You have two lungs, which sit on either side of the heart within the ribcage. Each lung is made up of sections called lobes. They are connected to the nose and mouth by the windpipe (trachea).
The lungs' job is to bring oxygen into the body and to remove carbon dioxide. Oxygen is a gas that provides us with energy, while carbon dioxide is a waste product of the body.
When you breathe in, air passes through a series of connecting tubes (called bronchi or airways) which are designed to take the air towards the bloodstream. The air meets the bloodstream at tiny air sacs called alveoli.