The main organ of the respiratory system is the lungs. These vital organs are responsible for the exchange of gases, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled from the body. The lungs are protected by the rib cage and are located in the thoracic cavity. Air enters through the trachea, branching into bronchi and then into smaller bronchioles, eventually reaching the alveoli, tiny air sacs where gas exchange occurs. Proper lung function is essential for sustaining life and is influenced by overall health, environmental conditions, and lifestyle choices.