creatinine is a normal waste product produced by muscle metabolism when your kidneys are functioning normally they filter creatinine and other waste products out of your blood and send them out of the body through urine
Tweet. This follows the page describing the basic anatomy of the lower respiratory tract. The term  tracheobronchial tree  or  respiratory tree  refers to the structures of bronchi and bronchioles that terminate with the alveolar ducts, sacs, and, finally, alveoli-that are contained within the lungs.herefore these structures are also referred to as  airways . This pages includes two diagrams of the airways-the main structure of the tracheobroncial tree being shown immediately below, and a second diagram showing the alveoli in further detail further down the page.
Each lung has sections called lobes. Two tubes called bronchi lead from the trachea (windpipe) to the lungs.The two main types of lung cancer are non-small cell lung cancer and small cell lung cancer.The types are based on the way the cells look under a microscope. Non-small cell lung cancer is much more common than small cell lung cancer.Tobacco smoking is the most common cause of lung cancer.Lung cancer is the leading cause of death from cancer in the U.S. and the number of deaths from lung cancer in women is increasing. For most patients with lung cancer, current treatments do not cure the cancer.ach lung has sections called lobes. Two tubes called bronchi lead from the trachea (windpipe) to the lungs.The two main types of lung cancer are non-small cell lung cancer and small cell lung cancer.