The blank space in the statement, “During fetal development, the alveolar-capillary system and the quantity of pulmonary surfactant usually are not sufficient to support life until the _________ week of gestation.”
The lung development in a fetus takes place in five different phases, namely, embryonic, pseudoglandular, canalicular, terminal saccular, and the alveolar period. Initially, the lungs appear as a bud and grow from the primitive esophagus. The appearance of lungs in fetus takes place after 26 days of conception. The development of the respiratory system takes place in stages.
Please refer to Clinical Application Case-1 for further information.
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