Surfactant factor is a substance found in the lungs, specifically in the walls of the alveoli. It is composed of phospholipids (80%), primarily dipalmitoylphosphatidylcholine (DPPC). It consists of 12% proteins and 8% lipids.
Function of the Surfactant Factor.
The main function of the surfactant factor is to reduce the tension of the alveoli. The surfactant forms a thin film or coating that comes into contact with the air and the alveolar epithelium. During expiration, it decreases the surface tension of the alveolus. By reducing alveolar tension, it prevents alveolar collapse, which could lead to significant respiratory difficulties.
For gas exchange to occur effectively, the alveolar walls must be extremely thin. The surfactant maintains the integrity of the alveolar wall and significantly reduces surface tension from 0.07 N/m to 0.01 N/m. The surfactant prevents the alveolus from collapsing due to the thinness of its wall while allowing for adequate gas exchange.
Its other function is immunological. The surfactant prevents pathogens such as viruses and bacteria from reaching the capillaries.
Synthesis of the Surfactant Factor.
The surfactant is produced by a group of specialized lung cells known as type 2 pneumocytes. The synthesis and production of surfactant begin at around 7 to 8 months of gestational age. For this reason, pulmonary maturity is crucial in premature infants. premature infants.
The absence or low levels of this factor can lead to respiratory distress syndrome.
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