A key process in surfactant secretion is exocytosis of LB, and there have been several ultrastructural observations of lamellar material passing from AT II cells into alveoli (reviewed in ref.
In one general practice sample, costochondritis, also known as costosternal syndrome and anterior chest wall syndrome, was the most common specific cause of anterior musculoskeletal chest pain, with a prevalence of 13%.
The following anatomic locations can all be potential sources of chest pain: 1  the chest wall including the ribs, the muscles, and the skin; 2  the back including the spine, the nerves, and the back muscles; 3  the lung, the pleura (the lining of the lung), or the trachea;