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%.
2. Pleurisy. Sternum pain due to pleurisy is caused by the inflammation of the pleura surrounding the lungs. So pleurisy causes the inner walls of the chest to inflame due to many chest or lung condition resulting in breastbone pain. Here are a few symptoms that can help you recognize that the pain is indeed due to pleurisy only: