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What is Surfactant contains? and explain in detail?
The low surface tension when the alveoli are small is due to the presence in the fluid lining the alveoli of surfactant, a lipid surface-tension-lowering agent. Surfactant is a mixture of dipalmitoylphosphatidylcholine (DPPC), other lipids, and proteins.Ref: Ganong review of medical physiology 23rd edition Page no: 597