Overview

The lungs are part of the respiratory system, a group of organs and tissues that work together to help one breathe.
Each lung is divided into lobes. The bronchial tree running through the lungs is made up of the windpipe, bronchus, bronchi, bronchioles, and alveoli.

The main function of the lungs is the process of gas exchange called respiration. In respiration, oxygen from incoming air enters the blood and carbon dioxide, waste gas from the metabolism, leaves the blood.

• Filtering waste products, excess water, and other impurities out of the blood.
• Regulating pH, salt, and potassium levels in the body.
• Regulating blood pressure and the production of red blood cells.
• Activating a form of vitamin D that enhances calcium absorption.