- A Actin
- B Lecithin
- C Mucous
- D Lysine
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Answer:
B
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Pneumocyte type-II cells are located in the alveoli of the lungs and are responsible for secreting a substance called lecithin. Lecithin acts as a surfactant, which helps reduce surface tension in the alveoli, preventing them from collapsing during exhalation. Without this surfactant, the alveoli would collapse and cause difficulty in breathing. Pneumocyte type-I cells are responsible for gaseous exchange in the lungs.
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