NBME 17 Area marked "D" (NBME Answers)

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submitted by ∗bingcentipede(356)

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A premature infant does not have mature surfactant levels until week 35. Being born at 28 weeks, his type II pneumocytes are not fully mature yet/haven't produced enough yet.

Type I and II pneumocytes line the basement membrane. Type I (C) are squamous, and type II (D) are cuboidal.

E: alveolar macrophage B: RBCs A: capillary endothelial cell?

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bingcentipede https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQrHTmn6IxzG-twQTApPopTSthywHj6PR00UKqWuzHyPwLe8Cf6&usqp=CAU +4

jj375 Here is a labeled diagram that may help! A) Capillary endothelium B) RBCs C) Type I pneumocyte D) Type II pneumocyte E) I kinda think these are alveolar macrophages https://ib.bioninja.com.au/_Media/lung-tissue-diagram_med.jpeg +10

j44n did anyone else think D was trying to show a lamellar body that ID's a type II pneumoyte +2

j44n my bad i meant B**** +

i_hate_it_here I sure did +

prostar Lamellar bodies are not visible in this magnification. They are viewed in Electron microscopy. +5