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jackryan123 jackryan123
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7 years ago
Infants have a substance in their lungs, surfactant. What is role of surfactant in the respiratory system?
 
  A) Expands the lungs with breaths
  B) Keeps alveoli from collapsing with breaths
  C) Removes fluid from the lungs
  D) Allows oxygen to move in the lungs
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7 years ago
Ans: B
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