Overview of the Pulmonary System/Lung Development Flashcards
Lungs are the only organ in mammals that can participate in ___________.
gas exchange
The lungs are the only organ that constantly surveys _____________.
the inside of the body (100% of cardiac output) and the outside of the body
The airway branches about 23 times. Gas exchange does not occur in the first _______ branch points.
16
There are two types of pneumocytes: ____________.
type I (simple squamous epithelium) and type II (secretory)
Differentiate ventilation and respiration.
Ventilation is the movement of air into and out of the lungs, while respiration is gas exchange.
The lungs develop from the embryonic ________.
endoderm
The lung buds develop ventrally into the mesoderm at week ________.
four
The lung buds develop from buds between the _____________.
4th and 6th branchial (aka pharyngeal) arches
At week _______, lung development is halted by impeding on the liver.
seven
When does the embryonic stage take place?
4-7 weeks
When does the pseudoglandular stage take place?
7-16 weeks
When does the canalicular stage take place?
17-26 weeks
What epithelium differentiates in the pseudoglandular stage?
Conducting airway epithelium
_____ percent of true alveoli don’t appear until after birth.
Ninety
The lungs bud off of the __________.
primitive foregut
