Exam (elaborations)
Fetal Gas Exchange and Circulation
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1. Which of the following embryonic germ layers gives formation to the respiratory system? a. Endoderm b. Mesoderm c. Ectoderm d. Periderm ANS: A The respiratory system—pharynx, lungs, and epithelial lining of the trachea and lungs—originates in the endoderm. Refer to Box 2-1 in the tex...
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