The organ primarily responsible for breathing is the lungs. Located within the thoracic cavity, the lungs are part of the respiratory system and facilitate the exchange of gases between the body and the environment. This process, known as respiration, involves inhaling oxygen from the air and exhaling carbon dioxide, a waste product of cellular metabolism. The diaphragm and intercostal muscles support lung action by regulating airflow through contraction and relaxation. Health conditions such as asthma, pneumonia, or chronic obstructive pulmonary disease (COPD) can significantly impair lung function, making the understanding of lung health crucial for overall well-being.