An experimental treatment cultures stem cells from a newborn's umbilical cord. In a lab dish, the stem cells give rise to type II cells, which in turn give rise to more type I cells. These stem cells will be added to the extracellular matrix of a donated lung which has been stripped of its respiratory cells. How will the cells act after they grow in the donated lung?
A. The stem cells will directly replace alveoli.
B. The type II cells will secrete surfactant and the type I cells will form the respiratory membrane in the alveoli.
C. Both type I and type II cells will produce surfactant.
D. The type I cells will secrete surfactant and the type II cells will form the respiratory membrane in the alveoli.
Answer: B
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