Your lungs take air in to give your body oxygen, which the body needs to work. Your lungs, like all the tissues in your body, are made up of billions of tiny specialized cells. Old lung cells die and are replaced by new, identical lung cells. This natural process helps ensure healthy lungs.
© 2000-2021 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.