Physiology · Respiratory System · Medium
Surfactant
Meaning: A lipoprotein mixture secreted by type II alveolar cells that reduces tension at the air–liquid interface and stops alveoli collapsing.
In practice: Premature babies may lack surfactant and develop respiratory distress syndrome.
Quick check
Two questions on related physiology words.
Which word means: A Y-shaped protein made by plasma cells that binds specific antigens; an antibody.
Answer: Immunoglobulin
Which word means: The ability of the body to maintain a stable internal temperature.
Answer: Thermoregulation
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