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%.
Chest wall pain, which is also known as costochondritis, is a common condition and is characterized by achy, sharp, or even pressure-like pain within the chest region. These symptoms may radiate out toward the shoulders and arms. In most cases, the precise source of the pain is not known.