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.
Cancer of the trachea. The trachea or âwindpipeâ is a long tube which runs from the mouth and nose to the lungs. It resembles an inverted tree trunk with branches which supply air to the lungs. These branches are known as âbronchiâ.It is located in the neck, in front of the oesophagus and is comprised of concentric rings of cartilage.ancer of the trachea is a rare form of cancer which accounts for a very small percentage of cancer cases. This is often known as bronchial cancer. There are several types of tracheal cancer, for example âsquamous cell carcinomaâ that develop within cells that line parts of the body such as the airways and throat.