Do our lungs produce surfactant even complete throughout our life, or it is produced only once in fetus?
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pulmonary surfactant continuously synthesized type II alveolar cells authoritative
Your lungs produce surfactant throughout life. It is not made only once during fetal development.
- Before birth: production rises sharply late in pregnancy, especially after about 32-34 weeks. This prepares the alveoli for air breathing at birth. Premature babies may not yet have enough, causing neonatal respiratory distress syndrome.
- After birth and in adulthood: specialized type II alveolar cells continuously make, store, secrete, recycle, and replace surfactant.
- Why ongoing production is needed: surfactant is continually used, recycled, broken down, and can be damaged by inflammation or lung injury. It lowers alveolar surface tension, helping keep the tiny air sacs open, particularly during exhalation.
So, fetal surfactant production is important for the first breath, but surfactant maintenance is a lifelong process. Fishman's notes that surfactant synthesis is regulated both during development and postnatally, with systems for secretion and reutilization.
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