Q: Which equation best represents the relationship between the number of bronchial generations formed before birth and after birth?

$$\text{Total generations} = 17 + 7$$

Question 1

During which week of embryonic development do the respiratory organs (larynx, trachea, bronchi, and lungs) begin to form?

Accepted Answer

4th week

Question 2

Which embryonic tissue gives rise to the epithelium and glands of the larynx, trachea, bronchi, and lungs?

Accepted Answer

Endoderm

Question 3

The laryngeal cartilages and muscles are derived from which pharyngeal arches?

Accepted Answer

4th and 6th

Question 4

What is the embryological basis of tracheoesophageal fistula (TEF)?

Accepted Answer

Incomplete division of the foregut during the 4th week due to defective development of the tracheoesophageal septum

Question 5

Which stage of lung development is characterized by the formation of major elements of the lung but no respiratory bronchioles?

Accepted Answer

Pseudo-glandular stage

Question 6

Surfactant secretion by alveolar type II cells begins at approximately which week of gestation?

Accepted Answer

20 weeks

Question 7

Which congenital anomaly is associated with insufficient thoracic space for lung development, such as in congenital diaphragmatic hernia?

Accepted Answer

Lung hypoplasia

Question 8

A newborn presents with underinflated lungs and alveoli containing fluid with a high protein content resembling a glassy membrane. What is the most likely diagnosis?

Accepted Answer

Respiratory distress syndrome (hyaline membrane disease)

Question 9

Which of the following factors does NOT influence normal lung development?

Accepted Answer

Maternal blood glucose levels

Question 10

In the canalicular stage of lung development, terminal bronchioles divide into respiratory bronchioles, which further divide into alveolar ducts. Respiration becomes possible at the end of this stage. Which weeks does this stage encompass?

Accepted Answer

16–26 weeks

Question 11

Which equation best represents the relationship between the number of bronchial generations formed before birth and after birth?

Accepted Answer

$$	ext{Total generations} = 17 + 7$$

Question 12

A chest X-ray of a newborn shows a firm lung that sinks in water. What does this finding indicate?

Accepted Answer

Stillborn infant's lung containing fluid, not air

Question 13

Which congenital anomaly is characterized by the formation of cysts due to dilation of terminal bronchi, often resulting from disturbance in bronchial development during late fetal life?

Accepted Answer

Congenital lung cysts

Question 14

Which of the following is a component of the VACTERL association?

Accepted Answer

Tracheoesophageal fistula

Question 15

Which embryonic structure separates the laryngotracheal tube from the foregut?

Accepted Answer

Tracheoesophageal septum

Question 16

A unilateral pulmonary agenesis is compatible with life. What compensatory change occurs in the existing lung?

Accepted Answer

Hyperexpanded lung

Question 17

Which stage of lung development is characterized by the formation of mature alveoli and well-developed epithelial-endothelial capillary contacts?

Accepted Answer

Alveolar period

Question 18

What is the primary cause of respiratory distress syndrome (hyaline membrane disease) in newborns?

Accepted Answer

Surfactant deficiency

Question 19

Which of the following statements about surfactant is correct?

Accepted Answer

Surfactant is a phospholipid secreted by alveolar type II cells

Question 20

A newborn with congenital diaphragmatic hernia is at risk for which pulmonary developmental abnormality due to reduced thoracic space?

Accepted Answer

Lung hypoplasia

Development of the Respiratory System: Embryology and Clinical Correlates

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