1. A neonate exhibits signs of respiratory distress. Which embryological development stage is most crucial for the proper formation of the respiratory system? A) Pseudoglandular B) Canalicular C) Saccular D) Alveolar Correct Answer: B) Canalicular Rationale: The canalicular stage, occurring from weeks 16 to 26 of gestation, is critical for the development of the airways and the structures necessary for gas exchange. 2. During a routine examination, a neonate is found to have a patent ductus arteriosus (PDA). Which physiological mechanism typically ensures closure of the ductus arteriosus after birth? A) Decrease in prostaglandin E2 levels B) Increase in fetal hemoglobin concentration

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