The functioning of the lungs is vital to the human physical structure. They provide the body with oxygen to keep cells happy and help maintain homeostasis. There are many carcinogens that cause cancer and stop the lungs from doing their job. Sometimes the cancer spreads and metastasizes. The patient's medical diagnosis is a malignant bronchial tumor and pulmonary-cerebral metastases. The lungs are two large bags located in the human body that optimize gas exchanges between the air breathed and the blood. (Lung Cancer, 2013) The lungs take in oxygen and release carbon dioxide. The lungs are made of spongy tissue that allows them to expand and contract. The lungs occupy most of the chest cavity. Due to the location of the heart, the right lung is slightly larger than the left lung. The base of the lungs rests on the diaphragm, which allows it to facilitate breathing. When breathing occurs, air enters through the mouth and/or nose and passes through the pharynx, larynx, and trachea. At this point in the body, the trachea divides into the right and left bronchi......