The stage of lung development, 6 mos. to after birth, during which the respiratory epithelium becomes squamous and the capillary loops are intimately related to the epithelium is the: glandular period vascular period alveolar period canalicular period acinar period
In the development of the lung, which of the following is NOT correct: alveolar collapse in hyaline membrane
disease is a result of insufficient surfactant
production alveoli continue to form postnatally alveoli contain specialized epithelial cells
which produce surfactant alveolar epithelium is derived from
splanchnic mesoderm
One-eighth to one-sixth of the adult number of alveoli are present in the lungs at birth. Their numbers increase after birth at least until _____ years of age. 1 2 4 6 10
Pulmonary surfactant most likely begins to form in the human fetus at about _____ weeks. 16 20 28 32 34
The terminal sac or saccular stage of lung development is characterized by the appearance of: secondary bronchi tertiary bronchi respiratory bronchi surfactant mature alveoli
The tracheoesophageal septum separates the: laryngotracheal tube and nasopharynx esophagus and nasopharynx laryngotracheal tube and esophagus laryngotracheal tube and oropharynx esophagus and oropharynx
The connective tissues of the lungs develop from splanchnic mesoderm. true false
The laryngotracheal diverticulum develops within the floor of the pharynx between arches: I and II II and III III and IV IV and VI none of the above