Development of Respiratory System Flashcards
What determines location of lung bud?
Retinoic acid in mesoderm of foregut
How many rounds of division do bronchial buds undergo?
approx 16
Up until what age do additional terminal sacs continue to form and differentiate
2 yrs
When do terminal bronchioles divide into respiratory bronchioles?
Weeks 16-28
When is there a sufficient number of capillaries present to guarantee gaseous exchange?
weeks 28-36
Name the 2 types of alveolar epithelial cells and their functions
Type I- Surface for gaseous exchange
Type II- Produce surfactant
Outline respiratory distress disease
- Inadequate surfactant production
- Can result in hyaline membrane disease
- Treated with surfactant replacement therapy
Where does the bronchi enter the lung?
hilum
What vertebrae does trachea extend from/to?
CVI- TIV/V
Which bronchus is larger?
Right one
list the parts from bronchus
Bronchus
lobar bronchi
segmental bronchi
bronchioles
What are the surfaces of the lung?
Apex
Base (diaphragmatic surface)
Costal surface
Mediastinal surface
How many lobes and fissures does right lung have?
3 lobes
2 fissures
How many lobes and fissures does left lung have?
2 lobes
1 fissure
What are bronchopulmonary segments?
Smallest functionally independent region of a lung
