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%.
Costochondritis is a condition that causes chest pain due to inflammation of the cartilage and bones in the chest wall. Costochondritis occurs when there is inflammation at the junction of the rib bone and breastbone (sternum). At this junction, there is cartilage joining these bones. This cartilage can become irritated and inflamed.